Experience must be bought. 吃一堑，长一智。

英语谚语类

意思是通过吃亏或失败的经历，可以获得智慧和经验。
上一篇：Experience is the father of wisdom and memory the mother. 经验是智慧之父，记忆是智慧之母。
下一篇：Fact speak louder than words. 事实胜于雄辩。