《史记·七十列传·乐毅列传》
太史公说： 当初齐人蒯通和主父偃读乐毅给燕王的那封信时，都曾不禁放下书信掉下眼泪来。
太史公曰：始齐之蒯通及主父偃读乐毅之报燕王书，未尝不废书而泣也。
Taishigong said: At the beginning, Kuaitong and Zhufu Yan of Qi read the letter Le Yi wrote to King Yan and couldn't help putting the letter down and shedding tears.