金剛經纂要刊定記 4.87

4.87

今則下。顯今經意。心即能緣，境即所緣，有即雙該心境，及心境所餘收不盡者，皆有字攝。空者，即離心境等相也。

Regarding "now, however, etc.": this reveals the intention of the present sūtra. The mind is the conditioning agent; the object is the conditioned realm. "Existence" encompasses both mind and object; and whatever remains of mind and object that is not fully covered is entirely subsumed under the word "existence". "Emptiness" means being free from the marks of mind, object, and so forth.