《梁书·本纪·卷一》
从前周公旦、召公奭，入宫保护辅佐，至于毕公、毛公，也做官卿士，兼任朝廷内外，逭确实是礼法相适宜的办法。
在昔旦、奭，入居保佑，逮于毕、毛，亦作卿士，任兼内外，礼实宜之。
In the past, the Duke of Zhou and the Duke of Zhao entered the court to help the king; and the Duke of Bi and the Duke of Mao served as senior officers, concurrently holding offices inside and outside the court. Yours is indeed what is appropriate for your status.