《史记·三十世家·楚世家》
庄王说： 郑国君能这样谦卑，就一定能任用自己的百姓，怎么可以断绝他的祭祀呢！ 
庄王曰： 其君能下人，必能信用其民，庸可绝乎！ 
King Zhuang said, "The monarch of Zheng can be so humble that he must be able to employ his people. How can he cut off his sacrifices!"