大般涅槃經疏 31.20

31.20

「迦葉言」下，第三觀漏果，亦兩問答。此初問答中又二：先明報果、次明習果。就報果中有三種苦及三無常者，二解：一云三苦即苦苦、行苦、壞苦。三無常者，一生滅、二流動、三大期。二云此謂三界為三苦，三無常者即是三界皆無常也。

From "Kāśyapa said..." onward is the third, contemplating the fruits of outflows, also with two questions and answers. Within this first question and answer there are also two parts: first, explaining the fruit of retribution; next, explaining the fruit of habituation. Regarding the three kinds of suffering and three kinds of impermanence within the fruit of retribution, there are two interpretations: One says that the three kinds of suffering are the suffering of suffering, the suffering of conditioning, and the suffering of deterioration; the three kinds of impermanence are: first, arising and ceasing; second, flux; third, the great period [of a lifetime]. The second says that this refers to the three realms as the three kinds of suffering; the three kinds of impermanence mean that the three realms are all impermanent.