《战国策·燕三·燕太子丹质于秦亡归》
太子拜了两拜，双腿跪行，泪流满面，过了好一会儿才说道： 我之所以告诫田光先生不要泄密，是想实现重大的计划罢了。现在田先生用死来表明他没有泄密，这哪里是我的本意呢？ 
太子再拜而跪，膝下行流涕，有顷而后言曰： 丹所请田先生无言者，欲以成大事之谋，今田先生以死明不泄言，岂丹之心哉? 
The crown prince paid him two homage and knelt there, rolling tears down his cheeks. After quite a while he said, "The reason why I warned Mr. Tian Guang not to divulge the secret was that I wanted to achieve a major plan. Now that Mr. Tian uses death to prove that he is guiltless, how can it be my intention?"