《史记·七十列传·刺客列传》
何苦自己摧残身体，丑化形貌，想要用这样的办法达到向赵襄子报仇的目的，不是更困难吗？ 
何乃残身苦形，欲以求报襄子，不亦难乎！ 
Why do you have to harm your body, disfigure your appearance, and try to use this method to achieve your goal of taking revenge on Xiang Zi? Isn't that even harder? 