疾風知勁草,烈火見真金 [ㄐㄧˊ ㄈㄥ ㄓ ㄐㄧㄣˋ ㄘㄠˇ , ㄌㄧㄝˋ ㄏㄨㄛˇ ㄐㄧㄢˋ ㄓㄣ ㄐㄧㄣ; ji2 feng1 zhi1 jin4 cao3 , lie4 huo3 jian4 zhen1 jin1]
the storm put strong grass to the test, fire tests true gold (idiom); fig. troubled times test a faithful minister
to show one's true colors after a stern test
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