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The definition of insanity is doing the same thing over and over and expecting different results.

— Albert Einstein Misattributed

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Source, in full

Variously attributed also to Benjamin Franklin and Mark Twain. The earliest known occurrence, and probable origin, is from a 1981 text from Narcotics Anonymous: "Insanity is repeating the same mistakes and expecting different results." Cf. .

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