... it is true that a mathematician who is not somewhat of a poet, will never be a perfect mathematician.

... es ist wahr, ein Mathematiker, der nicht etwas Poet ist, wird nimmer ein vollkommener Mathematiker sein.

Original text (German)

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Notes from Wikiquote

Letter to Sofia Kovalevskaya, August 27, 1883, as shared by Gösta Mittag-Leffler at the 2nd International Congress for Mathematicians in Paris. Compte rendu du deuxième Congrès international des mathematiciens tenu à Paris du 6 au 12 août 1900, Gauthier-Villars (Paris), 1902, page 149.

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