《汉书·传·杨胡朱梅云传》
王莽的长子王字，责备王莽隔绝卫氏，担心平帝长大以后怨恨。
莽长子宇，非莽隔绝卫氏，恐帝长大后见怨。
Wang Mang's eldest son, Wang Zi, criticised Wang Mang's isolation of Wei, and was worried that after Ping Di grew up, he would feel resentment.