Senses
百胜难虑敌，三折乃良医/ 百勝難慮敵，三折乃良醫 failure is the mother of success
One learns more from one's failures than from one's successes; literary expression by 刘禹锡 literally meaning that a hundred victories make it hard to evaluate an enemy, while breaking one's arm three times makes one a good doctor
References
No references for this word.