《隋书·列传·卷五》
何况三年的服丧期，从上到下，到时就除丧服，在礼仪虽未详细记载，但夫妻是人伦之始，丧失配偶是人道中最大的事，如不重视，就会取笑于君子。
况复三年之丧，自上达下，及期释服，在礼未详。然夫妇则人伦攸始，丧纪则人道至大，苟不重之，取笑君子。
Moreover, the three-year mourning period, from top to bottom, when the time comes, the mourning clothes are gone, although the etiquette is not detailed, but the husband and wife are the beginning of human relations, the loss of a spouse is the biggest thing in humanity, If you don't pay attention, you will be laughed at by gentlemen.