《晋书·志·第十章》
以圣人的伟大，帝王的嫡子，尚且根据实际情况而变通，以制定典礼。
夫以圣人之弘，帝者嫡子，犹权事而变，以定典礼。
Based on the greatness of the sage and the eldest son of the emperor, in accordance with the actual situation, one can alter to establish the ceremony.