成唯識論演祕 4.629

4.629

即五十二明彼無法得為意境，是此證也。彼文廣辨，今略引之。

This refers to the fifty-second [fascicle of the Yogācārabhūmi] clarifying that nonexistent dharmas can serve as objects of the manas, which is the proof for this. That text explains it extensively; now it is cited briefly.