Revenge is a dish best eaten cold.
La vengeance est un plat qui se mange froid.
Original text (French)
Notes from Wikiquote
Commonly said to be from Les liaisons dangereuses, but not found there.
Original text (French)
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Quote text and notes from Wikiquote: Pierre Choderlos de Laclos (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.