Tā niánqīng shí bùkěyīshì, hòulái cái xuéhuì qiānxū.
He was insufferably arrogant in his youth; only later did he learn humility.
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From Luo Dajing's Song-dynasty 《鹤林玉露》: 「荆公少年，不可一世」 - Wang Anshi (王荆公) in his youth considered no contemporary his equal. Originally neutral 'peerless'; now uniformly pejorative.
mistakes
Despite the literal 'unrivalled,' this is always negative in modern use - 'arrogant / conceited.' Compare with the positive 举世无双 ('unmatched in the world').
