Voltaire’s *Traité sur la tolérance* is a concise Enlightenment essay that argues for religious tolerance across sectarian divides. Composed in the late 18th century, the work responds directly to the execution of Jean Calas, a Protestant merchant wrongfully condemned for the murder of his son. Voltaire uses the incident to expose the lethal consequences of fanaticism and to appeal for a society in which differing beliefs can coexist without state‑sanctioned persecution. The treatise blends philosophical argumentation with historical illustration, employing clear rhetorical strategies to persuade both contemporary and future readers. Its brevity makes it accessible, yet its impact reverberated through subsequent debates on civil liberties and the separation of church and state. Though originally published in French, the text has been translated and reissued in various editions, including a paperback version by Du Temps in 2000 that remains in print. Scholars continue to reference the *Traité* as a foundational document in the history of human rights discourse.

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