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Voltaire and Frederick: a philosophical correspondence across centuries

In the eighteenth century, letter writing was the intellectual currency of Europe. Few exchanges burned as brightly as that between François-Marie Arouet, known to the world as Voltaire, and the young crown prince who would become Frederick II of Prussia. Their letters, written in French, spanned more than forty years and traversed topics from metaphysics to military strategy, from poetry to the proper seasoning of a macaron. Learn more about The French Fairy Tale Revival In The 19th Century.

The collection now available through digital libraries offers readers in Adelaide, Sydney, and beyond a direct line to the Enlightenment's beating heart. Australian readers, accustomed to summer reading by the harbour or in a Brisbane backyard, can approach these texts with the same curiosity that Frederick brought to his correspondents. The letters remain surprisingly modern in their wit, their grievances, and their restless search for meaning.

A prince in Potsdam and a philosopher in Ferney

The correspondence began in 1736, when Frederick was still a young man restlessly waiting to inherit the Prussian throne. Voltaire was already Europe's most celebrated writer, a reputation cemented by his tragedies and the scandalous success of the Lettres philosophiques of 1734. Frederick wrote to the Frenchman in fawning terms, and Voltaire, ever alert to a powerful admirer, replied with elegant flattery. Their early letters read like a courtship, each writer trying to outshine the other in Latin quotations, classical allusions, and pointed jokes.

By the time Frederick became king in 1740, the tone had matured. Voltaire visited Berlin in 1743, and again in 1750, when he accepted a pension to live at the court in Potsdam. The dream of a philosopher-king seemed within reach. Frederick built the palace of Sanssouci as a refuge from ceremonial life, and Voltaire imagined an intellectual haven where wit would be the only currency. The letters of this period are filled with plans for an academy, discussions of French drama, and complaints about the weather in Prussia.

Australian readers familiar with the political theatre of Canberra or the debates of state parliaments will recognise the dynamic. The letters capture the tension between power and ideas, between the man who rules and the man who writes. Voltaire flattered, mocked, and occasionally threatened, while Frederick oscillated between admiration and irritation. Their exchanges are not merely literary curiosities; they are case studies in how intellectuals navigate the corridors of the powerful.

Themes that echo through the letters

The philosophical letters between Voltaire and Frederick are not a single treatise but a sprawling conversation. They touch on religion, tolerance, the nature of happiness, the role of the state, and the future of European culture. In one letter, Voltaire defends the English constitutional model; in another, he ridicules the censorship of the Sorbonne. Frederick, for his part, writes about the duties of a sovereign, the pleasures of philosophy, and his own flute concertos.

The breadth of the correspondence is part of its charm. Unlike a systematic philosophical work, the letters follow the rhythm of their authors' lives. A birthday greeting slips into a discussion of the nature of the soul; a complaint about a toothache becomes a meditation on human frailty. This episodic quality gives the collection a human texture that polished treatises often lack.

The Voltaire-Frederick exchange stands as a high point of this epistolary tradition, one that extends backward to earlier masters of the form. Readers curious about the origins of French letter writing can turn to Sevigné's correspondence to see how the genre developed in the previous century.

Recurring subjects in the correspondence

The quarrel at Sanssouci

The friendship ruptured in 1753. Voltaire, by then a difficult guest, had quarreled with Frederick's president of the Berlin Academy, Maupertuis, and had circulated satirical verses about him. Frederick, embarrassed and angry, ordered Voltaire to leave. The philosopher's departure was ignominious: he was detained at the border, his luggage searched, and a manuscript of his satires confiscated. The letters of the following months are bitter, with Voltaire accusing Frederick of treachery and Frederick accusing Voltaire of ingratitude.

Yet the correspondence did not end. By the late 1750s, both men recognised that the other was too important to ignore. Voltaire retreated to Ferney, on the French-Swiss border, and resumed his role as Europe's most prolific letter writer. Frederick, embroiled in the Seven Years' War, sought intellectual companionship wherever he could find it. Their letters resumed, cooler in tone but still engaged, and continued until Voltaire's death in 1778.

Australian readers may notice parallels with local political feuds, whether in the backrooms of Melbourne's Trades Hall or the pages of the Sydney Morning Herald. The Voltaire-Frederick quarrel is a reminder that intellectual alliances are fragile, and that pride often writes what reason would forbid. It also shows that friendship, even when ruptured, can be rebuilt through letters.

Enlightenment letters and the Australian reader

The Enlightenment shaped the language of modern Australian democracy. The founders of the Australian colonies, from the administrators of New South Wales to the framers of the federation in 1901, drew on ideas about rights, representation, and religious liberty that Voltaire and his contemporaries had popularised. Reading the correspondence today, whether in a café in Perth or a university library in Brisbane, brings that heritage into focus.

The letters also reward readers interested in the history of ideas. They show how philosophy was conducted in the eighteenth century, not in lecture halls but in private correspondence, in the margins of books, and in the witty asides of salon conversation. Australian universities, from the University of Sydney to the Australian National University, have long taught the Enlightenment as a transnational movement, and the Voltaire-Frederick exchange is a perfect example of how ideas crossed borders.

For Australians, reading often happens by the water. Whether at a Sydney beach in January or a Melbourne pool in February, a book in hand is a common sight. Those planning to combine their reading with a swim would do well to observe basic swimming precautions before diving into the surf or the pool.

Australian connections to the Voltairean spirit

Reading the letters on digital platforms

The BnF Collection eBooks platform makes these letters accessible to anyone with a connection to the internet. Readers in Melbourne's inner north or in regional Queensland can browse the correspondence alongside other French public-domain works, from memoirs to novels, from poetry to philosophy. The platform's EPUB downloads allow the letters to be read on tablets, phones, or dedicated e-readers, and the personal library feature helps readers track their progress through Voltaire's vast output.

The format suits the content. The letters were written to be read, circulated, and discussed, and a digital edition preserves that sense of immediacy. Readers can follow the chronological unfolding of the friendship, or jump to specific moments, such as the 1753 quarrel or the reconciliation of 1757. Those who prefer lighter French works may wish to explore the [fairy tale revival](https://bnfcollectionebooks.com/insights/the-french-fairy-tale-revival-in-the 19th-century) of the nineteenth century, a movement that drew on Voltairean irony even as it looked back to earlier folk traditions. The juxtaposition shows how French literature reinvented itself across generations, and how a single platform can connect the philosophical letter of 1740 with the conte de fées of 1820.

Readers keen to begin their own journey through the Voltaire-Frederick correspondence can register for fuller access on the BnF Collection eBooks website, where the letters are accompanied by introductory essays and contextual notes. Whether you read in Hobart, Darwin, or anywhere in between, the letters of Voltaire and Frederick the Great offer a reminder that the search for reason, wit, and mutual understanding is a tradition without borders. Open the digital library today and let the eighteenth century speak to the present.