《汉书·传·萧何曹参传》
曹参脱帽谢罪说： 陛下自己觉得圣明英武比高皇帝如何? 
参免冠谢曰： 陛下自察圣武孰与高皇帝？ 
Cao Can took off his cap and apologized, and said: "Your Majesty, how do you think you compare to Emperor Gao in terms of wisdom and martial arts?"