俱舍論疏 25.54

25.54

論「由此證知至如理應思」，順成一切應果皆是不動。然利、鈍根於現法樂有退、不退，立退、不退法，及思、護等。《正理》廣成立應果有退也。

On the Śāstra's statement: "From this it is proven ... one should consider this properly": This confirms that all fruits of arhatship are unshakable. However, sharp and dull faculties have falling away and non-falling-away with respect to dwelling happily in the present life, establishing the dharma of falling away, the dharma of non-falling-away, as well as reflection, preservation, and so forth. The Nyāyānusāra extensively establishes that the fruit of arhatship admits of falling away.