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Phrase(s): An ounce of discretion is worth a pound of wit.
Prov. Knowing when to refrain from making jokes is better than being able to make jokes all the time. • Mabel makes fun of everybody, regardless of whether or not she hurts their feelings. Someone should tell her that an ounce of discretion is worth a pound of wit.
McGrawhill's American Idioms And Phrasal Verbs