“Doubt is not a pleasant condition, but certainty is an absurd one. What is most repellent in the System of Nature [of d'Holbach] — after the recipe for making eels from flour — is the audacity with which it decides that there is no God, without even having tried to prove the impossibility.”

— Voltaire , Oeuvres de Voltaire

Le doute n'est pas un état bien agréable, mais l'assurance est un état ridicule.
Ce qui révolte le plus dans le Système de la nature ( après la façon de faire des anguilles avec de la farine), c'est l'audace avec laquelle il décide qu'il n'y a point de Dieu , sans avoir seulement tenté d'en prouver l'impossibilité.
Letter to Frederick William, Prince of Prussia (28 November 1770). English: in S.G. Tallentyre (ed.), Voltaire in His Letters. New York : G.P. Putnam's Sons, 1919. p. 232. French: Au prince royal de prusse, le 28 novembre, in M. Palissot (ed.), Oeuvres de Voltaire: Lettres Choisies du Roi de Prusse et de M. de Voltaire, Tome II. Paris : Chez Baudoiun, 1802. p. 419
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Voltaire 167

French writer, historian, and philosopher 1694–1778

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