《后汉书·列传·皇甫张段列传》
皇甫规答说： 上天对于国王，如君王对于臣子，父亲对于儿子，以灾害妖异警诫他，使他至于福祥。
规对曰：天之于王者，如君之于臣，父之于子也。诫以灾妖，使从福祥。
Huangfu Gui replied: Heaven is to the king, as the monarch is to his subjects, as a father is to a son. He warned him with disasters and strange events to make him reach the blessing.