俱舍論記 8.86

8.86

「有色有情至故名想一」者，釋身想一第四識住。有色有情及與身一，竝如前釋。此異熟樂曾無厭時，故名想一。雖三定中亦起捨受，從多分故、據不厭故，故言想一。

"Material sentient beings […] therefore called 'one in ideation'": explaining 'one in body, one in ideation', the fourth abode of consciousness. 'Material sentient beings' and 'one in body' are both explained as before. This vipāka-pleasure is never wearied of; therefore it is called 'one in ideation'. Although equanimity feelings also arise in the third dhyāna, based on the majority and on the fact of not being wearied, it is called 'one in ideation'.