《贞观政要·卷五·论孝友》
魏徵回答说： 我愚钝，不能完全了解他们。我和许多皇叔交谈过，只有吴王和我谈的那几次话，让我感到汗颜。 
侍中魏征对曰： 臣愚暗，不尽知其能，惟吴王数与臣言，臣未尝不自失。 
Wei Zheng replied: I am dull and cannot fully understand them. I have talked to many uncles, only the few conversations I had with King Wu made me feel ashamed.