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Meaning of 有则改之,无则加勉

Lookup via: Pinyin | Radicals
有 yǒu 则 zé 改 gǎi 之 zhī , , 无 wú 则 zé 加 jiā 勉 miǎn (Trad.: 有則改之,無則加勉)
correct any mistakes you made, but maintain your good record if you did not make them (idiom)