《晋书·志·第十章》
如果觉得礼法中没有明文规定，那么有疑问时从重，认为应当像为祖母一样服齐绩一年。
若嫌明文不存，则疑斯从重，谓应同于为祖母后齐衰期。
If it is believed that there are no explicit provisions in the rules of propriety, then, in case of doubt, the weightier side should be taken, namely, it should be deemed that a full year of mourning should be observed as for one's grandmother.