大方廣圓覺修多羅了義經略疏 1.180

1.180

廣者，從用得名，廣多、廣博為義。廣多者，此圓覺性本有過塵沙之妙用，潛興密應，無有休息，無有窮盡。廣博者，此無盡之用一一同於覺性，無有邊際，無有分限。故文云：「覺性遍滿，圓無際故，當知六根遍滿法界，如是乃至八萬四千陀羅尼門遍滿法界。」

"Broad" (guang) receives its name from function, taking manifoldness and vastness as its meaning. "Manifoldness" means that this nature of perfect enlightenment inherently possesses wondrous functions exceeding the sands of the Ganges, quietly stirring and secretly responding without rest and without end. "Vastness" means that these endless functions are each identical to the enlightened nature, without boundary and without limitation. Thus the text states: "Because the enlightened nature is omnipresent and completely boundless, one should know that the six sense organs pervade the dharmadhātu, and so on up to eighty-four thousand dhāraṇī doors pervading the dharmadhātu."