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Phrase(s): One cannot love and be wise.
Prov. People often fall in love with someone with whom they are not compatible or behave foolishly when they are in love. • My son and his girlfriend have decided to get married in the spring. I don’t think that’s wise, since they won’t have enough money saved by then to set up house. But then, one cannot love and be wise.
McGrawhill's American Idioms And Phrasal Verbs