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Phrase(s): The road to hell is paved with good intentions.
Prov. People often mean well but do bad things. (Can be a strong rebuke, implying that the person you are addressing did something bad and his or her good intentions do not matter.) • Jane: I’m sorry. I didn’t mean to hurt your feelings; I only wanted to help you. Jane: Oh, yeah? The road to hell is paved with good intentions.
McGrawhill's American Idioms And Phrasal Verbs