know thyself
One is best served by studying and understanding one's own physical and psychological strengths, weaknesses, limitations, and influences. Look, I know you get wrapped up in what other people think and do, but you should focus on knowing thyself first and foremost. Only you can decide whether you have what it takes to keep on trying. Know thyself.
Farlex Dictionary of Idioms. © 2024 Farlex, Inc, all rights reserved.
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."
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.