《庄子·外篇·秋水》
公孙龙向魏牟问道： 我年少的时候学习古代圣王的主张，长大以后懂得了仁义的行为;能够把事物的不同与相同合而为一，把一个物体的质地坚硬与颜色洁白分离开来;能够把不对的说成是对的，把不应认可的看作是合宜的;能够使百家智士困惑不解，能够使众多善辩之口理屈辞穷：我自以为是最为通达的了。
公孙龙问于魏牟曰： 龙少学先王之道，长而明仁义之行；合同异，离坚白；然不然，可不可；困百家之知，穷众口之辩：吾自以为至达已。
Gongsun Long asked Wei Mou: "In my youth I studied the doctrines of the ancient sage-kings, when I grew up I understood the practices of benevolence and righteousness; I could unite the distinction and similarity of things, and separate the firmness of substance of an object from its whiteness of color; I could make falsehood appear to be true, regard the disapproveable as agreeable; I could cause the intellects of a hundred schools to be unable to comprehend, and tie the tongues of thousands of skillful disputants: I considered myself the most intelligent in the world."