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Phrase(s): Children and fools tell the truth.
Prov. Children have not yet learned, and fools never did learn, that it is often advantageous to lie. • Fred: What will I tell Ellen when she asks why I’m so late getting home? Alan: Tell her the truth— we were out having a few drinks. Fred: Children and fools tell the truth, Alan.
McGrawhill's American Idioms And Phrasal Verbs