《北史·列传·卷二十八》
这是圣人们根据人的感情制定的礼节，让孝子尽完自己对父母的哀悼之情。
此圣人缘情制礼，以终孝子之情也。
This is the etiquette that the sages have formulated according to people's feelings, so that filial sons can complete their mourning for their parents.