【三折肱，为良医】〖sn zhé gng，wéi liáng y〗[After having broken his upper arms for three times, he becomes a good surgeon -- experience is a good teacher]

三番五次阅历丰，

折节礼士获竭忠。

肱股贤臣安国泰，

为公舍己强大同。

良史之才诗典著，

医时救弊世太平。

几次断臂，就能知道医治断臂的方法。比喻对某事阅历多，富有经验，成为内行。也指高明的医道。A few times broken arms, can know the treatment of broken arms. Metaphor to something experience many, rich experience, nature attainments profound. Also refers brilliant  skill of a doctor.