《宋史·列传·卷一百七十三》
赵葵视师一年多，请求辞官，皇上不知如何安排他。郑清之说 ：不让他做宰相是不足以表达对他的酬劳的，陛下难道是因为我在宰相的位置上而不任命他吗？
赵葵视师年余，乞罢，上未有以处之，清之曰： 非使作相不足以酬劳，陛下岂以臣故耶？
Having supervised and trained the military for more than a year, Zhao Kui asked to resign from his post. The emperor did not know how to arrange things for him, but Zheng Qingzhi said: "To not make him a prime minister is insufficient to show our gratitude toward him. Is your majesty not appointing him to the position because I myself am in that position?"