《魏书·列传·卷十二》
张衮时常告诉别人说： 从前乐毅驱马前往燕昭王那裹，荀公达寄托自身给魏武帝，超越一世的人才难以期待，千年才有的机会不容易遇到。
衮每告人曰： 昔乐毅杖策于燕昭，公远委身于魏武，盖命世难可期，千载不易遇。
Zhang Gun often told people: In the past, Yue Yi rode a horse to seek refuge with King Yan Zhao of Yan, and Xun Gongda entrusted himself to Emperor Wei Wu, it is difficult to expect talents that surpass one generation, and it is not easy to encounter opportunities that arise only once in a thousand years.