Nothing is more dangerous than an idea, when you have only one idea.
Rien n’est plus dangereux qu’une idèe, quand on n’a qu’une idèe.
Original text (French)
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Source, in full
Propos sur le Religion [Remarks on Religion], no. 74 (1938), under the pen name Alain. Translation reported in Tony Augarde (ed.) The Oxford Dictionary of Modern Quotations (1991) p. 3. Alternate translation: "Nothing is more dangerous than an idea, when it's the only one we have."—IZQuotes (retrieved October 30, 2018)