大方廣佛華嚴經隨疏演義鈔 13.26

13.26

疏「此經明教即是如」下，復辨通局。謂但言十二分教即如，此如局在十二分中。若云如即佛教，則一切法皆如也，則一切皆佛教，斯義則通。故次疏云「若取諸法顯義體」，即明一切皆教。既一切皆如，如皆佛教也。

Regarding the commentary’s “This sūtra clarifies that the teaching is identical with tathatā…” and so forth, it further distinguishes between the general and the restricted. That is to say, if one merely says that the twelvefold division of the teaching is identical with tathatā, this tathatā is restricted within the twelve divisions. If one says that tathatā is identical with the Buddha's teaching, then all phenomena are tathatā, and therefore all are the Buddha’s teaching—this meaning is general. Hence the commentary subsequently says: “If one takes all phenomena as the essence that reveals the meaning,” it makes clear that all are the teaching. Since all are tathatā, tathatā is all the Buddha’s teaching.