Which idiom is used to describe praising the advanced and urging the backward?

Idiom: if there is something, change it, if there is nothing, encourage it.

—— Han Dian Zdic.net—

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Explanation: then: just; Supplement: supplement. If there are shortcomings and mistakes pointed out by others, correct them, if not, use them to encourage yourself. —— Han Dian Zdic.net—

Source: The Analects of Confucius Learn: "Zeng Zi said,' I visit me three times a day.' Song Zhuxi Notes: "Ceng Zi saves its health through these three aspects. If there is, it will change it, if not, it will encourage it. Its autonomy is so sincere that it can be said that it is the basis of learning. "

Example: Check yourself according to the opinions and criticisms put forward by your classmates.

Synonym: introspection.

Grammar: complex sentences; As a predicate; Include praise