俱舍論記 25.15

25.15

「言退法者至彼必無退」者，別釋六姓差別不同。言退法者，謂遇少緣便退所得，非思法等遇少緣退。言思法者，謂懼退失所獲功德，以刀扣頭恒思自害。言護法者，謂於所得恐退失故，喜自防護。安住法者，離勝退緣雖不自防亦能不退，離勝加行亦不增進，多住自位故名安住。堪達法者，彼性堪能好修練根速達不動。不動法者，不退動故，彼必無退。

Regarding "The one of falling-away dharma ... that one definitely has no falling away": this individually explains the distinct differences among the six lineages. "Falling-away dharma" means that upon encountering minor conditions one immediately falls away from what was attained; it is not that those of deliberating dharma and the rest fall away upon encountering minor conditions. "Deliberating dharma" means that out of fear of falling away from the virtues obtained, one strikes one's head with a knife and constantly deliberates on killing oneself. "Guarding dharma" means that because of fear of falling away from what was attained, one takes joy in guarding oneself. "Abiding dharma" means that apart from powerful conditions for falling away, even without guarding oneself one does not fall away; and apart from superior preparatory effort, one also does not advance; mostly abiding in one's own position, it is called "abiding." "Capable-of-advancement dharma" means that one's nature is capable and well-suited to practicing the training of faculties to quickly reach the immovable. "Immovable dharma" means that because one is not moved into falling away, that one definitely has no falling away.