俱舍論疏 28.173

28.173

論「第三有二至受有差別」，述後二定也。第三定中心悅細故，有意地樂。第四定中心轉寂故，唯有捨受也。「是謂定生受有差別」者，結也。

On the Śāstra's phrase: "The third has two [...] sensations have distinctions": this recounts the latter two dhyānas. In the third dhyāna, because mental elation is subtle, there is mental bliss. In the fourth dhyāna, because the mind becomes increasingly calm, there is only sensation of equanimity. "These are the distinctions among the sensations born of concentration" concludes it.