俱舍論疏 22.86

22.86

論「又契經言至變壞法故」，通第二經。經言以苦觀樂受者，樂受有二：一自相門，是可愛故是樂性；二依異門，無常、變壞是苦性。佛令異門觀為苦故，非自相門觀為苦也。

On the Śāstra's statement, "Moreover, the sūtra says... because it is a phenomenon subject to alteration": This resolves the second sūtra. When the sūtra says to observe pleasant sensation as suffering, pleasant sensation has two aspects: first, the approach of intrinsic characteristic, which because it is agreeable is of the nature of pleasure; second, relying on a figurative approach, impermanence and alteration are of the nature of suffering. Because the Buddha instructed that it be observed as suffering through the figurative approach, it is not that it is observed as suffering through the approach of intrinsic characteristic.