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Phrase(s): Experience is the teacher of fools.
Prov. Only fools do not learn after seeing other people’s mistakes and insist on repeating them. • Father: You should spend more time studying and less time having fun with your friends. If I had been a better student when I was your age, I’d have a better job now. Son: Oh, come on, Dad. School’s worthless. Father: Don’t make the same mistake I did! Experience is the teacher of fools.
McGrawhill's American Idioms And Phrasal Verbs