《史记·七十列传·春申君列传》
如今您任楚国宰相已经二十多年，可是大王没有儿子，如果楚王寿终之后将要改立兄弟，那么楚国改立国君以后，也就会各自使原来所亲信的人显贵起来，您又怎么能长久地得到宠信呢？
今君相楚二十馀年，而王无子，即百岁後将更立兄弟，则楚更立君後，亦各贵其故所亲，君又安得长有宠乎？
You have been the prime minister of Chu for more than 20 years, but the king has no son. If the king were to pass away and appoint his brother as the next king, after Chu has a new king, he would certainly promote the people he trusts. How could you expect to continue to enjoy the king’s favor?