俱舍論記 23.103

23.103

「然道類智至所斷斷故」者，牒外難通。外難意云：見道不退，修道有退。若道類智是修道攝，亦應有退。寧道類智必不退耶？論主通云：然道類智必不退者，以能任持見道所斷煩惱斷故，所以不退。以見所斷擇滅不退，故道類智亦不退也。

"However, mārga-anvaya-jñāna [...] because of the cessation of what is abandoned by [darśana-mārga]" takes up an external objection and resolves it. The intention of the external objection is: "Darśana-mārga has no falling back, whereas bhāvanā-mārga has falling back. If mārga-anvaya-jñāna is subsumed under bhāvanā-mārga, it too should have falling back. Why then is mārga-anvaya-jñāna necessarily free from falling back?" The author of the treatise resolves it, saying: However, the reason mārga-anvaya-jñāna is necessarily free from falling back is that it can sustain the cessation of the defilements abandoned by darśana-mārga; therefore it does not fall back. Because the pratisamkhyā-nirodha of what is abandoned by vision does not fall back, mārga-anvaya-jñāna also does not fall back.