因明入正理論疏 3.33

3.33

問：「今難有性應非有性，如何不犯自語相違？」答：「若前未立有性非實，今難實等能有非有，此言乃犯自語相違，亦違自教。彼先已成非實之有，今即難彼，破他違他，非成諸過。」

Question: 'Now, objecting that existence-ness ought not to be existence-ness, how does this not commit the fallacy of contradiction with one's own words?' Answer: 'If the opponent had not previously established that existence-ness is not substance, and one now objected that that which can possess substance and so forth is non-existent, these words would indeed commit the fallacy of contradiction with one's own words, and would also contradict one's own teaching. But since that opponent previously established an existence that is non-substance, now one simply objects against that, refuting the other and contradicting the other; it does not commit those fallacies.'