金剛般若經疏論纂要 1.117

1.117

無著云：「不可取者，謂正聞時；不可說者，謂正說時。非法者，分別性故；非非法者，法無我理故。」論云：「彼法非法、非非法，依真如義說。非法者，一切法無體相故；非非法者，彼真如無我實相有故。何故唯言說、不言證？有言說者，即成證義故；若不證者，則不能說。」

Asaṅga says: '"Cannot be grasped" refers to the very time of hearing; "cannot be spoken of" refers to the very time of speaking. "Not dharmas" is because of the conceptualized nature; "not non-dharmas" is because of the principle of the selflessness of dharmas.' The commentary says: 'Those dharmas are neither dharmas nor non-dharmas, which is spoken in reliance upon the meaning of tathatā. "Not dharmas" is because all dharmas lack essence and characteristics; "not non-dharmas" is because the real mark of tathatā's selflessness exists. Why only speak of preaching and not of realization? Because where there is preaching, the meaning of realization is thereby established; if one has not realized, then one cannot preach.'