大乘起信論義記 2.178

2.178

下釋空義，倒心妄境本不相應，故云遠離等，非謂有而不現，但以妄法理無故無可現；如鏡非不能現，但以兔角無故，無可現也。非覺照者，有二義：一、以妄念望於真智，無覺照之功，以情執違理故；如鏡非即外物，以彼外物無照用義故，即顯鏡中無外物體。二、以本覺望於妄法，亦無覺照功能，以妄本無故，如淨眼望空華；無照矚之功，亦如鏡望兔角。

Below, it explains the meaning of emptiness. Inverted minds and false sense objects fundamentally do not correspond; therefore, it says 'far removed,' and so forth. It does not mean they exist but do not appear; rather, simply because false phenomena do not exist in principle, there is nothing that can be manifested. It is like a mirror which is not incapable of reflecting, but simply because the hare's horns do not exist, there is nothing that can be manifested. 'Not of cognitive illumination' has two meanings: 1. False thoughts, when viewed in relation to true cognition, lack the efficacy of cognitive illumination because emotional clingings run contrary to principle; just as a mirror is not identical with external objects because those external objects have no illuminating function, which precisely reveals that within the mirror there is no substance of external objects. 2. Innate enlightenment, when viewed in relation to false phenomena, also lacks the function of cognitive illumination because the false is fundamentally non-existent; just as a clean eye looking at flowers in the sky lacks the efficacy of illuminating perception, it is also like a mirror looking at a hare's horns.