大方廣佛華嚴經隨疏演義鈔 11.67

11.67

疏「由住一遍應故，有廣狹自在門」者，即前本門第二門也。住一故狹，遍應故廣。言「就體就用」者，就體故相即，就用故相入，並通同體異體二門。

On the Commentary's "Due to dwelling in one and universally responding, there is the gate of the freedom of the broad and the narrow": this is the second gate of the original gates preceding. Dwelling in one, it is narrow; universally responding, it is broad. As for "in terms of essence and in terms of function": in terms of essence, they are mutually identical; in terms of function, they are mutually entering; both apply to the two gates of same essence and different essences.