強中自有強中手 [ㄑㄧㄤˊ ㄓㄨㄥ ㄗˋ ㄧㄡˇ ㄑㄧㄤˊ ㄓㄨㄥ ㄕㄡˇ; qiang2 zhong1 zi4 you3 qiang2 zhong1 shou3]
However strong you are, there is always someone stronger
There is always sth more to learn (applied to art or learning).
Never be satisfied to rest on you laurels.
There is no room for complacency.
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