《元史·列传·卷九十一》
所谓宰辅，就是辅佐天子而共治天下的人，为何找一个已被阉割的人充当？
宰辅者，佐天子共治天下者也，奈何辱以寺人。
The so-called prime minister is the one who assists the emperor and governs the world. Why appoint a castrated person for such a position?