大方廣佛華嚴經隨疏演義鈔 30.43

30.43

疏「初二句有無無礙」者，無即是理，有即是事。次句「定散無礙」者，恒住禪寂定也，由契心性理也。禪不繫心，不礙散地，即涉事也。

Regarding the commentary's phrase “The first two lines [show] unhindered existence and non-existence”: non-existence is the principle (li), and existence is phenomena (shi). Regarding the next line's “unhindered concentration and distraction”: constantly dwelling in meditative stillness is concentration, which is the principle realized through conforming to the mind-nature. When dhyāna does not bind the mind, it does not obstruct the distracted realm, which means engaging with phenomena.