有则改之，无则加勉 有則改之，無則加勉
yǒu zé gǎi zhī , wú zé jiā miǎn
Meaning
correct any mistakes you made, but maintain your good record if you did not make them (idiom)
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Characters
有yǒuto have, to own, to possess; to exist月则zérule, law, regulation; grades贝刂改gǎito alter, to change, to improve, to remodel己攵之zhīmarks preceding phrase as modifier of following phrase; it, him her, them; to go to丶无wúno, not; lacking, -less一尢加jiāto add to, to increase, to augment力口勉miǎnto endeavor, to make an effort; to urge免力