百勝難慮敵，三折乃良醫 [－胜难虑敌－－－－－医]
Jyutping
Pinyin
bǎi shèng nán lǜ dí , sān zhé nǎi liáng yī
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(a line from a poem by the Tang poet Liu Yuxi 劉禹錫|刘禹锡[Liu2 Yu3 xi1]) one gains very little insight into one's enemy from a hundred victories, but he who breaks his arm three times will be a good doctor
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(fig.) one learns more from one's failures than from one's successes