Men will always be mad, and those who think they can cure them are the maddest of all.

Les hommes seront toujours fous; et ceux qui croient les guérir sont les plus fous de la bande.

Original text (French)

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Notes from Wikiquote

Letter to Louise Dorothea of Meiningen, duchess of Saxe-Gotha Madame (30 January 1762)

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Quote text and notes from Wikiquote: Voltaire (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.