釋門歸敬儀 2.4

2.4

俗中《周禮》有九品之拜，出自〈太祝之官〉。斯非內教，然禮貴從俗故也。

In secular customs, the Rites of Zhou has nine grades of bows, originating from the "Office of the Grand Supplicator." These are not the inner teachings, but propriety values according with secular custom.