大方廣圓覺修多羅了義經略疏 2.216

2.216

The eye can see everything, but it alone cannot see the visual faculty itself. Furthermore, it is like the light of the eye illuminating objects: while the objects are myriad and varied, the seeing itself is one; hence it is called equal. It is merely spoken in reference to the absence of discriminating between superior and inferior in the minds of ordinary persons and sages that the meaning of equality is stated, yet there is also no one who produces this equality.