Voltaire and the Age of Reason

Voltaire stands as the defining intellectual of the European Enlightenment — a writer, philosopher, historian, satirist, and tireless agitator whose sixty-year career reshaped the way educated Europeans thought about religion, government, justice, and the powers of human reason. Born into the prosperous bourgeoisie of Paris in 1694, he lived until 1778, dying just as the intellectual revolution he had done more than any single person to create was about to transform itself into political upheaval. His name, adopted as a pen name in his twenties and retained ever after, became synonymous with a quality of mind: sharply rational, ironic, committed to the evidence of experience over the dogmas of tradition, and incapable of accepting an injustice in silence. He was not the most systematic philosopher of his age — that distinction belongs to Kant, or perhaps Hume — but he was far and away the most influential, the one who reached the widest audience, whose works were read in courts and salons and coffeehouses from St. Petersburg to Philadelphia, and whose arguments became the common intellectual property of an entire civilization.

To understand Voltaire is to understand the Enlightenment itself: its strengths and its limitations, its astonishing program of intellectual liberation and its sometimes uncomfortable relationship with political power, its sincere commitment to tolerance and its occasional blindness to its own prejudices, its conviction that reason could solve problems that religion had only perpetuated and that the free exchange of ideas was both a moral right and the indispensable foundation of a decent society. He was not a saint, not a systematic philosopher, not a political democrat in any modern sense. He was something rarer and in the historical context more important: a man of genius who devoted his gifts to the service of a cause — the liberation of the human mind from superstition, cruelty, and the abuse of power — and who pursued that cause with an energy, a wit, and an intelligence that were without parallel in his age.

Early Life and Education

François-Marie Arouet was born on November 21, 1694, in Paris, the fifth child and younger son of François Arouet and Marie Marguerite Daumard. His father was a successful notary and minor court official — upper bourgeoisie rather than nobility, prosperous but not aristocratic, with connections to the Parisian legal world and the fringes of high society. His mother died when he was seven, and he was raised primarily by his father, a practical, conventional man who had little sympathy for his son's literary ambitions and repeatedly attempted to channel him toward a legal career.

The education he received, however, was superb. At the age of ten he entered the Collège Louis-le-Grand, the great Jesuit school in Paris that educated the sons of the French elite. He would spend seven years there, from 1704 to 1711, receiving a thorough classical education in Latin, Greek, rhetoric, drama, and philosophy that furnished his mind for the rest of his life. The Jesuits at Louis-le-Grand were accomplished teachers — intellectually demanding, attuned to literary quality, and in their own way committed to the powers of reason — and Voltaire responded to their teaching with an enthusiasm and a brilliance that made him the star student of his cohort. He produced Latin verses of precocious quality, excelled in theatrical productions, and developed the social charm and gift for self-presentation that would make him one of the most sought-after conversationalists in Europe.

He also developed, at Louis-le-Grand, the habit of questioning that would define his intellectual life. The Jesuit curriculum was rigorous and demanding, but it was also thoroughly orthodox, and the questions it raised — about the foundations of belief, the authority of tradition, the relationship between reason and revelation — were questions that a mind as restless as his could not leave unanswered. His later attacks on Jesuit influence and Catholic institutional power were not the attacks of an outsider but of someone who knew his opponents intimately, who had been educated by them, and who had spent years observing the gap between their professed values and their actual practices.

After leaving Louis-le-Grand in 1711, he entered the literary society of Paris through a series of connections that would shape his early career. His godfather, the Abbé de Châteauneuf, introduced him to the libertine circle associated with the Temple — a group of aristocratic freethinkers, skeptics, and poets who gathered around the Grand Prior of Vendôme and cultivated a sophisticated irreligion that was fashionable in certain quarters of Parisian high society. There he encountered the Epicurean tradition of philosophical skepticism, the arguments of Spinoza and the classical atomists, and the social world of the aristocracy whose patronage he needed and whose manners he rapidly acquired.

His father, alarmed by these associations, twice attempted to redirect his career. He sent him to study with a notary, which Voltaire found intolerable and abandoned. He arranged for him to go to The Hague as secretary to the French ambassador, from which Voltaire returned precipitately after falling in love with the daughter of a Huguenot refugee. By 1715, at the age of twenty-one, he was back in Paris, writing satirical verses and establishing himself in the literary world, with no career except literature and no patron more reliable than his own talents.

The Pen Name and the Bastille

His first imprisonment in the Bastille came in 1717, when he was twenty-two years old. He had been circulating verses that satirized the Regent of France, Philippe, Duke of Orléans, and the Orleans family generally — accusations of incest, political corruption, and financial misconduct set out with the elegance of classical verse and the venom of personal hostility. The regent's government had him arrested and imprisoned in the Bastille, where he spent eleven months, from May 1717 to April 1718.

The imprisonment, paradoxically, was not entirely disastrous. He was housed in reasonable comfort, was allowed books and writing materials, and used the time to complete his first major play, Oedipe, and to revise and expand his epic poem on Henri IV that would eventually become La Henriade. More importantly, the imprisonment gave him a public profile — the young poet imprisoned for satirizing the great was a romantic figure, and his release was accompanied by a celebrity that his talents alone might have taken longer to achieve.

It was at this period that he adopted the pen name Voltaire — replacing the birth name François-Marie Arouet with a name that was probably an anagram of Arouet le jeune using the conventional Latin equivalences, though he never fully explained the choice. The adoption of a pen name was both a practical measure — putting some distance between his satirical productions and his family name — and an act of self-creation, a declaration that he was constructing a public persona that would be different from, and more powerful than, the bourgeois son of a Parisian notary.

Oedipe was performed at the Comédie-Française in November 1718 to enormous success, establishing him at twenty-four as the leading young playwright of France. The play adapted the Sophocles story but infused it with a distinctly Voltairean theme: the corruption and pride of priests, who appear in the play as conspirators against both truth and justice. The success of Oedipe launched a theatrical career that would produce dozens of plays over the next six decades, making him the dominant figure in French theater for much of the eighteenth century.

La Henriade, the epic poem celebrating Henri IV of France as a model of religious tolerance and rational kingship, was first published secretly in 1723 and in an authorized edition in 1728. The poem was politically daring — its celebration of religious tolerance was an implicit critique of the religious wars that had devastated France in the sixteenth century and of the revocation of the Edict of Nantes in 1685 — and its literary qualities were genuine, establishing Voltaire as a serious poet in the French classical tradition. The poem's dedication to the English queen consort Caroline helped secure him the English royal family's favor during the English exile that followed.

A second imprisonment in the Bastille, in 1726, came as a result of the Chevalier de Rohan affair. The Chevalier de Rohan-Chabot, a minor member of one of the greatest aristocratic families of France, had been publicly insulted by Voltaire's wit — the exact nature of the exchange is disputed, but in one version Rohan asked contemptuously who was this Arouet or Voltaire, and Voltaire replied that while he did not carry a great name, he at least honored the name he had. Rohan arranged for Voltaire to be beaten by his servants in the street while he watched from a carriage, and then, when Voltaire attempted to challenge him to a duel and sought satisfaction through legal channels, used his aristocratic connections to have him imprisoned in the Bastille again. The episode was revelatory: in a society defined by birth, even the most celebrated literary genius was vulnerable to the casual brutality of the aristocracy, and the law offered no redress when the aggressor was nobly born.

The English Exile and Its Consequences

The second Bastille imprisonment ended with an offer that amounted to a command: Voltaire could remain imprisoned or go into exile in England. He chose England, arriving in May 1726 and remaining there until early 1729 — roughly two and a half years that would prove among the most formative of his intellectual life.

England in the late 1720s was, by the standards of the continent, a remarkably free society. The Glorious Revolution of 1688 had established constitutional monarchy and limited government; the Bill of Rights had codified political liberties; the Toleration Act had ended the worst religious persecution; and the intellectual culture of Newton and Locke had transformed the way educated Englishmen thought about nature, knowledge, and government. Religious dissent flourished in a dozen competing sects — Quakers, Presbyterians, Baptists, Methodists, Unitarians — who competed with the established Church of England in a relatively open market of ideas rather than facing imprisonment or execution for their beliefs. The resulting intellectual vitality, Voltaire immediately sensed, was not accidental but structural: it was the consequence of political and religious liberty.

He threw himself into English life and English learning with characteristic energy. He improved his already considerable English, met virtually every significant intellectual and literary figure in London — Pope, Swift, Congreve, Bolingbroke, Clarke, Berkeley — and attended scientific demonstrations and philosophical lectures. Most importantly, he read deeply in the English intellectual tradition: Locke's Essay Concerning Human Understanding and Two Treatises of Government, Newton's Principia and Opticks, Bacon's advancement of learning, and the works of the English religious dissenters. He also attended Quaker meetings, which fascinated him not for their theology but for their practice — their pacifism, their refusal of social hierarchies, their plain speech that treated everyone as equal — which seemed to him a living demonstration that religion could be practiced without the elaborate institutional machinery of priests, rituals, and persecutions.

He also encountered Shakespeare, whose plays were being performed in London throughout his stay. Shakespeare represented something entirely different from the classical French theater in which Voltaire had been trained: a drama of extraordinary energy and human complexity, indifferent to the classical unities of time, place, and action, mixing comedy and tragedy, high and low characters, verse and prose, in ways that violated every principle of French dramatic theory. Voltaire's relationship with Shakespeare was lifelong and conflicted — he admired his genius while deploring what he considered his barbarism, praised his power while lamenting his formlessness — but the encounter was genuinely important: it introduced him to a theatrical tradition radically different from his own and forced him to think about the relationship between artistic rules and artistic achievement.

The literary product of the English exile was the Lettres philosophiques, also known as the Lettres anglaises, published in France in 1734. The book took the form of a series of letters from England describing English religion, philosophy, government, and culture, addressed implicitly to a French reader who would immediately understand the contrast between the England being described and the France being implicitly criticized. The letters on the Quakers opened the book with maximum subversive effect: here were religious people who treated every person as an equal, refused to fight wars, refused to take oaths, and practiced a simple faith without priests or ceremonies, and who were tolerated — even respected — in English society. What would happen if such people lived in France?

The letters on Newton and Locke celebrated the empirical method and its products: the theory of universal gravitation, the theory of knowledge based on sensory experience, the political theory derived from natural rights rather than divine right. The letters on the English government contrasted parliamentary monarchy with French absolutism — noting that in England merchants could become peers, that taxes required parliamentary consent, and that no one was imprisoned without trial. The letters on the theater and literature were more conventional, but they made the same implicit point: English intellectual life had produced great things because it was free, while French intellectual life, constrained by censorship and academic orthodoxy, had not yet achieved what it was capable of.

The Paris Parlement ordered the Lettres philosophiques burned in June 1734 — it was, the official decree said, "scandalous, contrary to religion, morals, and respect for authority." A warrant was issued for Voltaire's arrest. He fled Paris and made his way to the château of Cirey in Champagne, where his companion the Marquise du Châtelet had prepared a refuge, and settled into what would prove to be the most intellectually productive period of his life.

Émilie du Châtelet and the Years at Cirey

The relationship between Voltaire and Gabrielle Émilie Le Tonnelier de Breteuil, the Marquise du Châtelet, was one of the great intellectual partnerships of the Enlightenment, and one of the more complicated romantic relationships in a century that produced many of both. They met in 1733, when she was twenty-six and he was thirty-eight, and they remained in close partnership until her death in 1749 — fifteen years that encompassed intense intellectual collaboration, genuine affection, periods of conflict, and a shared project of understanding the natural world according to Newton's principles that changed French intellectual life.

Émilie du Châtelet was, by any measure, one of the most remarkable intellects of the eighteenth century. She had educated herself in mathematics and natural philosophy at a time when women were systematically excluded from formal education in those subjects, achieving a mastery of calculus, mechanics, and Newtonian physics that placed her among the serious scientists of the era. Her translation of Newton's Principia Mathematica from Latin into French — the only French translation ever made, still the standard translation today — was not merely a linguistic exercise but a work of scientific interpretation, with original commentary and mathematical developments that went beyond Newton's own text. Her Institutions de physique was an original work of natural philosophy that attempted to reconcile Newtonian physics with the Leibnizian metaphysics she had also mastered. She was, in short, not Voltaire's student or companion but his intellectual equal and in certain respects his superior.

The château of Cirey, which du Châtelet's husband had allowed her to renovate and occupy, became one of the most remarkable private intellectual establishments of the century. She equipped it with laboratories for scientific experiments — one of the first private laboratories for experimental physics in France. Voltaire maintained a library of eventually more than six thousand volumes. They worked alongside each other, she on Newton and natural philosophy, he on history, drama, and the philosophical questions that were becoming the central concern of his mature career. Visitors who came to Cirey — and many came, from Parisian society, from the world of letters, from the aristocracy and the intellectual world — found an establishment unlike any other: the greatest writer of France living with the most learned woman of the century, in an atmosphere of intense intellectual activity that left no room for the conventional social rituals of aristocratic life.

Voltaire's scientific engagement during the Cirey years produced his Éléments de la philosophie de Newton, published in 1738. The book was a systematic introduction to Newton's physics for a general French audience, covering the theory of light and colors, the theory of universal gravitation, and the methodology of natural philosophy. It was not original scientific work — Voltaire was a brilliant popularizer rather than an original researcher — but it was enormously important for the reception of Newtonian science in France, where Cartesian vortex theory still had many defenders among the academicians of the Académie des sciences. The dedication to du Châtelet acknowledged her role in his scientific education, and the book's success in persuading French educated opinion of the superiority of Newtonian mechanics over Cartesian physics was a genuine intellectual achievement.

The intellectual partnership with du Châtelet also deepened Voltaire's philosophical engagement with the questions of metaphysics and religion that would occupy him for the rest of his life. Du Châtelet was interested in the Leibnizian doctrine of optimism — the argument that God, being perfect, had created the best of all possible worlds — and her engagement with this doctrine forced Voltaire to take it more seriously than he might otherwise have done. He was initially sympathetic to a version of it; later, events would turn him against it with a violence that produced his greatest work.

Du Châtelet died in September 1749, of puerperal fever following childbirth. She had become pregnant, at the age of forty-two, by the young poet Saint-Lambert, in a relationship she had pursued with Voltaire's resigned acceptance. Her death left Voltaire devastated. He wrote to a friend that he had not lost merely a mistress but "a great man" — the highest tribute in the vocabulary available to him, where the word for a powerful, original mind was masculine. The loss was not merely personal but intellectual: he had lost the person who challenged his thinking most rigorously, who shared his deepest commitments, and whose presence had made Cirey the extraordinary place it had been.

The Philosophical Tales: Candide and the Art of Satire

The form in which Voltaire made the widest and most lasting impact on world literature was the philosophical tale — a short, fast-paced narrative that used wit, irony, and deliberate improbability to expose the follies and cruelties of the world while advancing philosophical arguments with an elegance that no treatise could match. He produced dozens of these tales over the course of his career, but one of them, Candide, published in January 1759, is among the most widely read works of European literature and arguably the masterpiece of Enlightenment prose.

Candide ou l'Optimisme — Candide, or Optimism — tells the story of its naïve young hero's education through catastrophe. Candide grows up in the castle of the Baron Thunder-ten-Tronckh in Westphalia, where his tutor Dr. Pangloss teaches him the Leibnizian doctrine of optimism: everything happens for the best in this best of all possible worlds; every cause produces the best possible effect; the nose was designed for wearing spectacles. Expelled from the castle for kissing the Baron's daughter Cunégonde, Candide is conscripted into the Bulgarian army and subjected to savage military discipline, witnesses wars, massacres, and atrocities across Europe and the New World, meets the destitute Pangloss again (hideously deformed by syphilis, which he insists was necessary to bring syphilis to Europe, which was necessary for chocolate), survives the Lisbon earthquake of 1755, is tried by the Inquisition, discovers El Dorado, and eventually settles with his companions in a small garden in Turkey, where the book ends with his famous conclusion: "Il faut cultiver notre jardin" — we must cultivate our garden.

The attack on Leibnizian optimism was the philosophical heart of the book, and the Lisbon earthquake was the historical event that gave it its urgency. On November 1, 1755 — All Saints' Day, when the churches were full — a massive earthquake followed by tsunami and fire destroyed much of Lisbon and killed between ten thousand and forty thousand people. The disaster horrified Europe, and the question of how to reconcile it with a providential view of the universe became an urgent philosophical problem. Voltaire had already published his Poème sur le désastre de Lisbonne in 1756, attacking the optimists' attempts to explain the earthquake as somehow consistent with divine benevolence. Candide, three years later, was his full satirical assault on the position.

Dr. Pangloss represents Leibniz and, more broadly, any philosophical system that insists on reconciling the evidence of experience with a preordained conclusion about the goodness of the world. Every catastrophe that befalls Candide and his companions — the earthquake, the auto-da-fé, the Atlantic crossing, the slavery they witness in Suriname — Pangloss explains away with an ingenuity that is both logically impeccable and morally grotesque. The joke, sustained across the length of the narrative, is that the explanation is always technically available and always obscene — that optimism, as Voltaire portrays it, is not a consoling philosophy but a form of complicity with cruelty, a way of refusing to see the world as it is in order to maintain an abstract doctrine about how it must be.

The garden at the end is not a retreat from the world but a program for engagement with it. When Candide says we must cultivate our garden, he is not proposing mystical withdrawal or Epicurean detachment from public life. He is proposing that meaningful human activity consists in working — in the concrete, physical, productive labor of making something grow, in cooperation with others, in a defined place, with limited but achievable goals. The contrast is with Pangloss's empty theorizing on the one hand and with the restless, violent quests for wealth and power that consume most of the other characters on the other. The garden is a metaphor for the actual, the practical, the achievable — for the Enlightenment conviction that real improvement in the human condition comes not from grand metaphysical systems but from the patient application of intelligence to specific problems.

Candide is also one of the great works of narrative comedy, a book of relentless satirical energy in which every institution of eighteenth-century European life — the army, the Church, the Inquisition, the aristocracy, the colonial enterprise, the philosophical establishment, the literary world — is exposed to a withering irony that has lost none of its force in two and a half centuries. The speed of the narrative, the economy of the prose, the precision of the satirical targets, and the underlying moral seriousness that gives the comedy its weight together constitute a literary achievement of the first order.

Voltaire's other major philosophical tales include Zadig (1747), the story of a young Babylonian nobleman who repeatedly attempts to achieve happiness through wisdom and virtue and is repeatedly frustrated by the operations of chance, arbitrary power, and the incomprehensibility of providence; Micromégas (1752), in which a giant from a planet orbiting Sirius visits Earth and finds its inhabitants laughably small, violent, and philosophically confused; and L'Ingénu (1767), in which a Huron Indian discovers European civilization and finds it no more rational or humane than the savagery he has supposedly left behind. Each of these tales uses a displacement strategy — putting the story in an exotic setting, or using a naive observer from outside European civilization — to defamiliarize the familiar institutions and assumptions of eighteenth-century France, making their absurdity and cruelty visible by removing the habitual acceptance that made them invisible.

Voltaire's Deism: the Watchmaker God

Voltaire was a theist but not a Christian, a believer in God but not in revelation, miracles, or the institutional churches that claimed to mediate between humanity and the divine. His theological position is best described as deism — the view that the existence of the universe and the order of nature constitute sufficient evidence for the existence of a creator God, but that no specific religion's claims about that God's special intervention in history, communication through scripture, or mediation through priests has any evidential foundation.

The watchmaker metaphor that became canonical in Enlightenment deist theology was one Voltaire used repeatedly: the universe, with its extraordinary complexity, its physical laws, and its evident design, was like a watch — it implied a watchmaker, a designer who had created and set it in motion. But — and this was the crucial Voltairean move — the watchmaker did not then intervene in the operation of the mechanism. The God of deism was not the God of Abraham, Isaac, and Jacob; was not the God who performed miracles, answered prayers, or sent his son to die for human sins. He was the God of the philosophers — a rational necessity inferred from the evidence of nature, too distant and too perfect to concern himself with the particulars of human history.

This position allowed Voltaire to attack revealed religion on two fronts simultaneously. Against atheism, he maintained that the existence of God was philosophically demonstrable from the evidence of natural order — "If God did not exist, it would be necessary to invent him," as he wrote in his Épître à l'Auteur du Livre des Trois Imposteurs (1768), arguing that belief in a judging God was socially necessary even for those who found the philosophical arguments for God's existence inconclusive, since without the prospect of divine judgment morality would have no ultimate foundation. Against Christianity and the other revealed religions, he maintained that their specific claims — miracles, prophecies, special revelation, priestly authority — had no rational support and a great deal of historical evidence against them.

This latter argument he pursued with an energy and a ruthlessness that exceeded anything his contemporaries dared. The Dictionnaire philosophique, published clandestinely in 1764, was a portable compendium of Enlightenment arguments against religious orthodoxy — a series of alphabetically arranged articles on religious, philosophical, and historical subjects that collectively constituted a sustained attack on revealed religion, ecclesiastical institution, and theological superstition. The articles on Abraham, Paul, miracles, the soul, the Bible, and religious tolerance were among the most radical theological arguments published in the eighteenth century, and the book was condemned and burned in several countries. Voltaire characteristically denied authorship; almost no one was fooled.

His famous battle cry — Écrasez l'infâme, crush the infamous thing — was directed not at religion as such but at what he called l'infâme: the combination of fanaticism, superstition, and religious persecution that had, in his view, made the institutional churches the enemies of human happiness and rational civilization. He was not opposed to private religious belief, to a simple natural religion accessible to all human beings through reason, or to a God inferred from the order of nature. He was opposed to priests who wielded political power, to churches that persecuted dissenters, to inquisitors who tortured heretics, to theologians who condemned reason in the name of faith. L'infâme was the institutional perversion of religion, the use of the sacred as an instrument of oppression, and it was l'infâme that he devoted the great campaigns of his later life to crushing.

The Calas Affair and the Treatise on Tolerance

The most important single episode in Voltaire's career as a public intellectual — the event that demonstrated most fully what one person of exceptional gifts and tireless determination could accomplish against entrenched injustice — was his campaign on behalf of Jean Calas, a Protestant merchant of Toulouse who had been wrongfully convicted and executed in 1762.

Jean Calas was a sixty-four-year-old cloth merchant and Calvinist Protestant, living in Toulouse with his wife and children. In October 1761, his son Marc-Antoine was found dead, apparently hanged. The Catholic community of Toulouse, which had a long and intense tradition of anti-Protestant sentiment, immediately spread the rumor that Marc-Antoine had been about to convert to Catholicism and that his father had murdered him to prevent the conversion. The rumor had no factual foundation — Marc-Antoine showed no sign of intended conversion, and the physical evidence was consistent with suicide — but it fell on fertile ground: Toulouse had a history of anti-Protestant violence, and the civic authorities were susceptible to popular pressure.

Jean Calas was arrested, tried before the Parlement of Toulouse, convicted on the basis of evidence that was essentially nonexistent, and sentenced to death. He was broken on the wheel — a method of execution in which the limbs were crushed by a wheel and the victim left to die in agony — on March 10, 1762, maintaining his innocence to the end. His wife was sentenced to exile, his property was confiscated, and his Protestant faith was publicly treated as the motive for the crime.

Voltaire learned of the case some weeks after the execution. He was at Ferney, his estate on the Swiss-French border, retired from Paris and seemingly settled into the role of patriarch of the Enlightenment. He was nearly seventy years old and might reasonably have decided that one more miscarriage of justice in the south of France was not his affair. Instead, he spent the next three years of his life investigating the case, corresponding with lawyers, magistrates, and government officials, writing pamphlets and essays, organizing a European campaign of public opinion, and ultimately forcing the royal Council of State to reopen the case and in 1765 to exonerate Jean Calas posthumously.

The method of the campaign was characteristic of Voltaire at his most effective. He first established the facts, interviewing witnesses, reading the trial documents, and becoming convinced that the conviction had been a judicial murder. He then published his Traité sur la tolérance (Treatise on Tolerance), in 1763, which used the Calas case as the occasion for a comprehensive argument against religious persecution, drawing on historical evidence from the conflicts between Catholics and Protestants, between Christians and Jews, between ancient Greeks and Athenians, to argue that religious fanaticism was a consistent enemy of justice, civilization, and humanity's genuine religious aspirations.

The Treatise on Tolerance was not merely a legal brief for Calas's rehabilitation but a philosophical argument for the principle of religious liberty. Its central claim was that the God of natural religion — the God accessible to reason rather than to revelation — demanded tolerance, since the diversity of human religious opinion was a fact of nature and God could not have intended that human beings should murder each other over theological disagreements that human reason alone could not resolve. The historical chapters showed that the Christian tradition had been exceptionally violent in its persecution of dissent, making Christianity an unreliable guide to the tolerance it nominally preached.

The rehabilitation of Jean Calas in 1765 was a remarkable achievement, one without clear precedent in French legal history: an official verdict had been reversed through the operations of public opinion and the sustained pressure of a single writer's pen. Voltaire's response was characteristic: he celebrated the exoneration, expressed grief that it had come too late to save Calas's life, and immediately turned to the next case.

The Chevalier de la Barre and the Sirven Affair

The exoneration of Jean Calas had barely been celebrated when Voltaire was confronted with an even more shocking case of judicial religious persecution. In 1765, the year Calas was posthumously rehabilitated, a nineteen-year-old nobleman, François-Jean de la Barre, was arrested in Abbeville on charges of sacrilege — specifically, of mutilating a crucifix on a bridge, singing blasphemous songs, and failing to remove his hat during a religious procession. These were alleged offenses against religious decency, and in the legal culture of the ancien régime they could carry severe penalties. The judge in the case found a copy of Voltaire's Dictionnaire philosophique in de la Barre's possession and included it in the evidence of his irreligion.

The Chevalier de la Barre was condemned to death. The sentence required him to have his tongue cut out, his right hand cut off, and then to be burned alive. In the event, he was beheaded before burning — a mercy — but the sentence was carried out in its essentials on July 1, 1766. He was nineteen years old. Another young man implicated in the same offenses fled to Ferney and placed himself under Voltaire's protection.

The de la Barre affair horrified Voltaire as no previous event had done. The Calas affair had been a case of judicial murder in which the process, however corrupt, had at least the form of a trial based on evidence, however fabricated. The de la Barre case was something more nakedly terrible: a young man killed for blasphemous songs and a failure of ceremonial deference, on the basis of evidence that included owning one of Voltaire's own books. The implication was unmistakable: owning Voltaire's works could be held against you as evidence of criminal irreligion. The fact that the Dictionnaire philosophique had been specified in the evidence made the affair personal in a way the Calas case had not been.

Voltaire's campaign on behalf of de la Barre's memory was less successful than the Calas campaign — de la Barre was dead and the French government showed no inclination to acknowledge that the execution had been unjust. But the affair radicalized Voltaire. His campaign against l'infâme, already intense, became still more urgent; his correspondence shows a new note of desperation and anger, a sense that the battle was not merely one of ideas but a fight against a system of persecution that had the power to kill people for thoughts and words. He considered leaving France permanently and settling in Prussia or Russia, countries whose rulers had at least committed themselves rhetorically to Enlightenment principles.

Simultaneously with the de la Barre affair, Voltaire was engaged in another campaign of Protestant rehabilitation — the Sirven affair. Pierre-Paul Sirven, a surveyor in the Languedoc region, had been convicted in absentia of murdering his daughter Elizabeth to prevent her conversion to Catholicism — the same charge that had been brought against Jean Calas, in the same region, with the same lack of evidence. Sirven and his family had fled to Geneva and then to Ferney, where Voltaire took up their case. The campaign for Sirven's rehabilitation was longer and less dramatic than the Calas campaign — it concluded with Sirven's official exoneration in 1771 — but it demonstrated that the Calas affair had not been an aberration but part of a systematic pattern of anti-Protestant persecution in the south of France.

These campaigns transformed Voltaire from a literary celebrity and philosophical gadfly into something new in European civilization: the public intellectual, the individual writer who used the power of print and the authority of reason to intervene in public affairs, to challenge judicial decisions, to shape public opinion, and to hold power accountable to the principles of justice and humanity. The concept of the public intellectual, with all its subsequent history in European and world culture, is in many respects Voltaire's invention — or at least his most important practical demonstration.

Voltaire and Frederick the Great

The relationship between Voltaire and Frederick II of Prussia — who came to be known as Frederick the Great — was among the most remarkable intellectual friendships of the eighteenth century and one of its most instructive disappointments. It extended over nearly half a century, from their first correspondence in 1736 to Voltaire's death in 1778, and it illuminated with particular clarity both the possibilities and the contradictions of the Enlightenment's relationship with political power.

Frederick was twenty-four and still Crown Prince of Prussia when he first wrote to Voltaire in 1736, presenting himself as an admiring young philosopher-prince who had read Voltaire's works and wished to correspond with the greatest man of the age. Voltaire responded with equal warmth. The correspondence quickly developed into something genuine on both sides: Frederick was a serious intellectual who had written a philosophical treatise attacking Machiavelli's political realism (the Anti-Machiavel, which Voltaire helped edit and publish), who composed French verse of respectable quality, who played the flute, and who was genuinely committed to the application of Enlightenment principles to government. Voltaire saw in Frederick the possibility he had long hoped for: an enlightened ruler who would use power in the service of reason rather than tradition, who would demonstrate that Enlightenment values could be realized through reform from above rather than requiring the revolutionary upheaval from below.

Frederick became King of Prussia in 1740, and his early reign seemed to vindicate Voltaire's hopes. He abolished judicial torture, which Voltaire had campaigned against for years. He relaxed press censorship. He welcomed religious minorities — Huguenot refugees from France, Catholics in largely Protestant Prussia — with a genuine if calculating tolerance. He surrounded himself with French intellectuals, corresponded with the philosophes, and invited Voltaire repeatedly to visit. The model of the enlightened despot — the ruler who used absolute power in the service of rational reform, who governed according to reason rather than tradition or religious prescription — seemed to have found its fullest realization in Frederick's Prussia.

Voltaire arrived at the Prussian court in Potsdam in July 1750, at the age of fifty-five, and for three years served as the resident intellectual celebrity of the court of Sans-Souci. Frederick's palace and court were among the most brilliant in Europe; the company was stimulating; and Voltaire, despite his advanced age and declining health, was in many respects at the height of his powers. He had his own apartment in the palace, access to the royal library, and freedom to write, converse, and correspond.

The specific mechanism of the disaster was a quarrel with Pierre-Louis Moreau de Maupertuis, the president of the Berlin Academy of Sciences and a man of genuine scientific accomplishment — he had led the expedition to Lapland that measured the flattening of the Earth at the poles, confirming Newton's prediction. Maupertuis had, however, become megalomaniacal in his scientific claims, asserting priority for discoveries he had not made and attacking rival scientists with an arrogance that Voltaire found intolerable. The conflict came to a head over a dispute between Maupertuis and a German mathematician, König, in which Voltaire sided with König and attacked Maupertuis in a devastating satirical pamphlet, the Diatribe du Docteur Akakia, in which Maupertuis was depicted as a pompous fraud.

Frederick, who valued Maupertuis and resented the disruption to his court, forbade Voltaire to publish the pamphlet. Voltaire published it anyway. Frederick had copies publicly burned. Voltaire requested permission to leave the court, was detained at Frankfurt on Frederick's orders while his manuscripts and a copy of the king's private poems that Voltaire had been given were recovered, and eventually made his way back to France in the summer of 1753, bitter and humiliated.

What the Berlin episode revealed was the fundamental tension between Enlightenment philosophy and enlightened despotism. Frederick was genuinely enlightened in many respects, genuinely committed to rational governance, and genuinely intelligent and sophisticated. But he was also an absolute monarch whose authority was not subject to rational criticism when he chose to assert it, whose commitment to Enlightenment values was real but bounded by his own interests and authority, and who expected Voltaire to serve his court rather than to express his own views freely. The Enlightenment, at its deepest level, was about the freedom to criticize power — and power, however enlightened, ultimately would not permit itself to be criticized without limit.

The correspondence between Voltaire and Frederick resumed after 1754 and continued until Voltaire's death. It was, in some respects, more candid after the rupture than before it: both men knew the other's limitations more clearly and could engage with greater honesty. Frederick wrote with genuine admiration and affection; Voltaire responded with carefully calibrated warmth that never quite matched the king's in sincerity. The friendship was real, but so were the lessons of Berlin.

Ferney: the Patriarch of the Enlightenment

In 1758, at the age of sixty-four, Voltaire purchased an estate called Ferney on the Swiss-French border near Geneva, and established there what would become for the next twenty years one of the most important intellectual centers in Europe. The location was strategically chosen: near enough to Geneva to allow rapid escape to Swiss territory if the French authorities decided to arrest him, near enough to France to remain engaged with French cultural and political life, and at the intersection of several major trade routes that made it accessible to visitors from across Europe.

Ferney was not merely a retirement retreat but an active establishment. Voltaire transformed what had been a small, run-down property into a flourishing enterprise: he built a theater, established workshops for silk-weaving and watchmaking to provide employment for the local population, planted gardens and orchards, and organized the systematic improvement of the estate and the surrounding village. He was simultaneously a writer producing at his former rate, a campaigner against injustice taking up case after case of persecution and oppression, a correspondent in communication with virtually every major intellectual and political figure in Europe, and a local seigneur responsible for several hundred dependents whose welfare he took seriously.

The twenty years at Ferney — from 1758 to 1778 — were among the most productive of his life, despite his advanced age and chronic poor health (he was famously hypochondriacal about his health, though genuinely ill, and survived predictions of his imminent death for decades). He continued to produce plays, poems, histories, philosophical tales, polemical pamphlets, and dictionary articles at a rate that would have exhausted a younger man. He engaged in the Calas and Sirven affairs, the de la Barre affair, and dozens of lesser-known cases of injustice. He published the Dictionnaire philosophique. He corresponded with Catherine the Great of Russia, Frederick of Prussia, d'Alembert, Diderot, Hume, Adam Smith, Benjamin Franklin, and hundreds of others.

The pilgrimage to Ferney became one of the defining rituals of the Enlightenment. Virtually every young intellectual of any European country who could manage the journey came to pay homage to the patriarch — James Boswell came, and left a vivid account of his visit; Casanova came; Edward Gibbon, then beginning his research on the Roman empire, spent time in Geneva and had contact with Voltaire; numerous French philosophes came regularly. The great man received visitors in his study or his garden, often in bed (a theatrical pose he enjoyed), and impressed them with his energy, his wit, and his undiminished capacity for intellectual engagement.

He continued to write and to campaign. The Philosophical Dictionary, the historical works, the late plays, the polemical writings on justice and tolerance — all emerged from Ferney with an energy that belied his age and health. The pattern of his engagement with the world remained consistent: he would learn of an injustice, investigate it, form a view, and then deploy his entire arsenal of weapons — legal argument, historical example, satirical wit, appeals to public opinion, letters to ministers and monarchs — in the service of correcting it. The cases he took up ranged from major scandals like the Calas and de la Barre affairs to the concerns of individual peasants on his estate who had been cheated or oppressed by local authorities.

The scope of his correspondence at Ferney was extraordinary. He wrote thousands of letters — his complete correspondence fills more than twenty-one thousand letters, the largest epistolary production of any writer in the Western tradition. These letters ranged from the political and philosophical — long exchanges with Frederick on the nature of monarchy, with d'Alembert on the progress of the Encyclopédie, with Catherine on the reforms she proposed for Russia — to the literary and personal, to the polemical and practical, to the frivolous and funny. The correspondence was both a record of his intellectual life and an instrument of his public campaign: letters were copied, circulated, and sometimes published, and Voltaire used them deliberately to shape opinion, to recruit allies, and to apply pressure on those in positions of power.

Voltaire's Histories and the Philosophy of History

Among Voltaire's contributions to European intellectual life, his historical writing is perhaps the least fully appreciated, yet it was among the most influential. Before Voltaire, the writing of history in the European tradition was dominated by two competing models: the political-military chronicle, which narrated the actions of kings and armies, and the providentialist universal history, which saw the events of human time as the unfolding of God's plan for salvation. Voltaire challenged both models, proposing a secular, cultural history of human civilization that anticipated, in many respects, the historical methods of the nineteenth and twentieth centuries.

His Histoire de Charles XII, published in 1731, was his first major historical work and introduced the methods that would characterize his historical writing throughout his career. The book narrated the life of the Swedish king Charles XII, who spent his entire reign in spectacular military campaigns that ultimately ruined Sweden. Voltaire had met and interviewed men who had known Charles personally, and he used this oral testimony alongside written sources to produce a narrative of unusual vividness and immediacy. The moral of the book was characteristic: brilliant military talent, divorced from wisdom and concern for the welfare of subjects, was ultimately destructive.

Le Siècle de Louis XIV, published in 1751, was a more ambitious work — a comprehensive account of the reign of the Sun King that went beyond political and military events to encompass culture, arts, religion, commerce, and what Voltaire called the "spirit" of the age. The book is a landmark in historiography: among the first major historical works to argue that cultural and intellectual achievement is as historically significant as political events, and that the historian's proper subject is not just the actions of rulers but the texture of an entire civilization. Voltaire's treatment of Louis XIV combined genuine admiration for the cultural achievements of the reign — the flourishing of Molière, Racine, Lully, and Versailles — with sharp criticism of the king's religious intolerance, particularly the revocation of the Edict of Nantes.

The Essai sur les moeurs et l'esprit des nations — Essay on the Manners and Spirit of Nations — was the most radical of his historical projects. Working on it for most of his mature career and publishing it in full in 1756, Voltaire constructed a universal history of human civilization that began, deliberately and provocatively, not with ancient Israel or Greece and Rome — the conventional starting points of European universal history — but with China and India. The argument was unmistakable: the Christian European tradition was not the center of human history but one tradition among many, and the providentialist framework that had organized previous universal histories — in which all events led toward the triumph of Christian civilization — was not history but theology disguised as history.

The Essai replaced divine providence with secular causes: climate, custom, law, commerce, the "genius" of peoples. Historical change was explicable in human terms, and the historian's task was to understand those terms, not to discern the hand of God in events. This approach made Voltaire one of the founders of what would later be called the philosophy of history — the attempt to identify general patterns and causes in the historical process rather than merely narrating its episodes.

The Return to Paris and the Triumphal Death

Voltaire spent the last two decades of his life at Ferney without returning to Paris. He was too famous, too controversial, and too well aware of the risks of appearing in the capital: the French government had never formally retracted the warrants issued against him, and a return to Paris could easily have ended in another imprisonment. He remained the patriarch of Ferney, receiving visitors, corresponding with the world, and waging his campaigns from a safe distance.

In February 1778, at the age of eighty-three, he finally returned to Paris. The occasion was the premiere of his last play, Irène, at the Comédie-Française. He had not been in Paris for twenty-eight years, and the return was the occasion for a spontaneous popular celebration of extraordinary intensity. The city received him with an enthusiasm that astonished even the well-organized Voltaire — crowds lined the streets as his carriage passed, crowds gathered at his lodgings, and he was received at the Académie française and at the Comédie-Française with ceremonies that amounted to a secular canonization.

At the Comédie-Française, his bust was crowned on stage with a wreath of laurels while the audience applauded. At the Académie française, he was elected director and received with an address of homage that was more panegyric than greeting. Benjamin Franklin, who was in Paris as the American representative seeking French support for the revolution, brought his grandson to Voltaire to be blessed, and Voltaire placed his hands on the child's head and said: "God and Liberty." The encounter between the two great exponents of Enlightenment rationalism on both sides of the Atlantic was one of the symbolic moments of the age.

He was not well. The excitement of the return, the constant visitors, the sleepless nights of reception and celebration, were too much for a man of eighty-three with a lifetime of poor health. He fell seriously ill in May 1778, and died on the night of May 30, 1778 — appropriately, refusing the last rites of the Church until his final hours, when his family and the clergy around him extracted from him a statement of submission that was ambiguous enough to satisfy neither his Catholic neighbors nor his philosophe friends.

The manner of his death was immediately contested. The Catholic press reported that he had died in terror and anguish, expressing repentance for his life's work and begging for absolution. His philosophe friends maintained that he had died calmly and in good humor, consistent with his principles. The truth was almost certainly somewhere between these versions: he was genuinely frightened as death approached, made various statements to various people that admitted of different interpretations, and died in a condition that was neither the triumphant philosophic calm his admirers claimed nor the guilty terror his enemies insisted on.

Voltaire and the French Revolution

Voltaire died in 1778, eleven years before the French Revolution he had in many respects helped to create. The revolutionaries who claimed him as an ancestor were not wrong to do so: the intellectual culture of the Enlightenment, of which he was the most prominent popularizer, had delegitimized the traditional justifications for absolute monarchy and ecclesiastical authority, had established the principle that human institutions should be justified by reason and evaluated by their consequences for human welfare, and had created the concepts of religious tolerance and civil liberty that became, in the revolutionary period, political demands rather than philosophical arguments.

In 1791, the revolutionary government transferred his remains from their resting place in Champagne to the Panthéon in Paris, the former church of Sainte-Geneviève that had been converted into a secular mausoleum for the great men of France. The procession through Paris was an extraordinary event — tens of thousands of people lined the streets to watch the coffin pass, and the ceremony at the Panthéon was one of the great spectacles of the revolutionary period. The inscription on his tomb read: "He avenged Calas, La Barre, Sirven, Montbailly. Poet, philosopher, historian, he made a great stride for the human spirit and prepared us to be free."

The revolutionaries' Voltaire was, however, a simplified version of the historical figure. The real Voltaire was not a democrat and was deeply skeptical of popular sovereignty. He believed in reform from above, in enlightened monarchy as the most practically effective vehicle for rational governance, and in the education of elites rather than the mobilization of the masses. He was an elitist in his cultural values, an aristocrat in his social aspirations (he spent his life seeking the company of the nobility and was genuinely pleased when kings and queens corresponded with him), and a political reformer rather than a political revolutionary.

He was also not, in the modern sense, a defender of democracy. He believed in freedom of expression for the educated and sophisticated, but he could be contemptuous of the uneducated and the fanatical. He believed in religious tolerance but thought the common people needed religion to keep them moral — his famous remark about God being necessary for society was partly a sincere philosophical argument and partly a social prejudice. He was critical of the institutional churches but not of religion as such; he was a committed opponent of persecution but not of hierarchy.

The revolutionary appropriation of Voltaire was, then, a partial truth: he had genuinely contributed to the intellectual revolution that made the political revolution possible, but his own politics were those of enlightened reform rather than democratic upheaval. He would likely have been horrified by the Terror and the guillotine. He might, in the end, have been more comfortable with the constitutional monarchy of 1789 than with the republican radicalism of 1793.

Legacy and the Meaning of "écrasez L'infâme"

The famous quotation "I disapprove of what you say, but I will defend to the death your right to say it" — widely attributed to Voltaire and used as the canonical expression of his commitment to free expression — was not written by Voltaire. It was invented by Evelyn Beatrice Hall, writing under the pseudonym S. G. Tallentyre, in her 1906 biography The Friends of Voltaire, as a paraphrase of what she believed to be the spirit of his position on the Helvétius affair. Hall herself acknowledged that the words were hers, not Voltaire's, but the attribution has persisted because the paraphrase captures something true and important: Voltaire did defend the right of people he disagreed with to express their views, and he did so not merely in theory but in practice, at personal risk.

The real Voltaire was more complicated and more interesting than the convenient symbol. His commitment to free expression was genuine and deep, but it was not unlimited or abstract — it was rooted in a specific historical analysis of what institutional religious censorship had done to European civilization and in a conviction that the free exchange of ideas was the only reliable method for correcting errors and establishing truth. His commitment to tolerance was similarly rooted in history: he had studied the religious wars of the sixteenth and seventeenth centuries, the St. Bartholomew's Day Massacre, the Thirty Years' War, the persecution of the Huguenots, and he had concluded that religious intolerance was not merely morally wrong but historically catastrophic.

His cry of Écrasez l'infâme — crush the infamous thing — was not an abstract slogan but a specific diagnosis: the infamous thing was the combination of superstition, fanaticism, and institutional religious persecution that had caused immeasurable human suffering. He was not opposed to religion as such but to the perversion of religion into an instrument of oppression. His deism, his natural religion accessible through reason, was his positive theological program; his campaigns against l'infâme were its negative corollary.

In the two and a half centuries since his death, Voltaire's reputation has undergone the inevitable revisions that come with time. His plays, which dominated French theater in his lifetime, are now rarely performed — they seem to modern audiences overly formal, constrained by the classical conventions he never fully transcended. His poetry, celebrated in the eighteenth century as the finest in French, has not worn equally well. But Candide is as fresh and as devastating as when it was written; the Treatise on Tolerance is as relevant in a century of resurgent religious extremism as it was in a century of Catholic and Protestant mutual persecution; the Philosophical Dictionary remains a model of lucid, irreverent, well-informed philosophical argument; and the historical works, particularly the Essai sur les moeurs, remain significant contributions to the development of modern historical writing.

More importantly than any individual work, Voltaire established a model for the intellectual life: the writer as public conscience, the person of ideas as participant in public affairs, the commitment to reason and tolerance and human dignity as the proper application of intellectual gifts. The tradition of the engaged intellectual — from Zola's J'Accuse to Sartre's interventions to contemporary writers who use their platforms to challenge injustice — runs directly through Voltaire. He invented, or at least exemplified, the role of the public intellectual as a distinctive contribution to modern civilization, and that contribution has outlasted his plays, his poems, and most of his philosophy.

He remains, in the end, one of the handful of individuals who genuinely changed the world they lived in — not by wielding political power, which he never held, but by the sustained application of intelligence, wit, and moral commitment to the problems of his age. His century produced many great minds; none used their gifts more directly, more persistently, or more effectively in the service of human freedom.

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www.lib.berkeley.edu/find/guides/enlightenment

www.newworldencyclopedia.org/entry/Voltaire

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