大方廣佛華嚴經隨疏演義鈔 20.15

20.15

疏「一明前大用，用無用相」等者，此二義中，一用同體寂、二用同體遍。言方便二者，一由忘寂故不礙用、二由依寂故能起用。

Regarding the commentary's statement, "First, clarifying that the previous great functioning has the functioning of no functioning-marks," etc.: within these two meanings, first, functioning is identical with the quiescence of essence; second, functioning is identical with the omnipresence of essence. As for the two upāyas: first, due to forgetting quiescence, it does not impede functioning; second, due to relying on quiescence, it can give rise to functioning.