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Phrase(s): Sufficient unto the day is the evil thereof.
Prov. You should not worry about things that might happen in the future.; It is enough to worry about things that are happening today. (Biblical.) • Jane: I can’t get to sleep; I keep thinking about the interview I have to do tomorrow. Alan: If the interview is tomorrow, worry about it tomorrow. Sufficient unto the day is the evil thereof.
McGrawhill's American Idioms And Phrasal Verbs