俱舍論疏 22.48

22.48

The treatise says: "If pleasant feelings, up to what is impermanent is suffering"—this is the answer. First it answers the reason why the three feelings constitute suffering, and afterwards it answers the reason why conforming [formations] are suffering. This text is the first. Pleasant feeling constitutes suffering because it is suffering when it deteriorates. As the sūtra says: "Pleasant feelings are pleasant when arising and pleasant when persisting, but suffering when deteriorating." Before deteriorating, their arising and persisting are both pleasant; only when they deteriorate are they called suffering; thus we know that pleasure constitutes suffering through deterioration. If unpleasant feelings constitute the nature of suffering through their intrinsic entity, as the sūtra says: "Unpleasant feelings are suffering when arising and suffering when persisting." Since both arising and persisting are suffering, we know they constitute the nature of suffering through their intrinsic entity. If neither-unpleasant-nor-pleasant feelings constitute the nature of suffering through conditioned formations, they are called conditioned formations because they are constructed by manifold conditions. As the sūtra says: "What is impermanent is suffering." Since it says that what is impermanent is suffering, we know that neither-unpleasant-nor-pleasant feeling, not being the former two, constitutes suffering precisely through conditioned formations. The Nyāyānusāra says: "Of contaminated impermanent things, none is not suffering."