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Phrase(s): Know thyself.
Prov. Be aware of your own limitations; know what you are capable of doing. (This was the motto inscribed on the temple of Apollo at Delphi.) • The motto of the ballet corps was "Know thyself "; every dancer was expected to know how far she could stretch, and not hurt herself by trying to exceed her limits. • "Know thyself," the high school guidance counselor admonished us, "and try to find a career that makes the most of your abilities."
McGrawhill's American Idioms And Phrasal Verbs