俱舍論記 3.90

3.90

「毘婆沙師至故非異熟」者，毘婆沙師復為好解咸作是說：已離欲者無憂根故，以彼憂根離欲捨故。異熟不然，非離欲捨故，說憂根非是異熟。

On "The masters of the Vibhāṣā ... therefore not karmic maturation": The masters of the Vibhāṣā, furthermore offering an excellent explanation, all spoke thus: because one who is free from desire has no faculty of grief, for that faculty of grief is abandoned upon freedom from desire. Karmic maturation is not like that, for it is not abandoned upon freedom from desire; hence they say that the faculty of grief is not karmic maturation.