俱舍論頌疏論本 11.53

11.53

樂生三者，三靜慮中於九處生，受三種樂，一於初靜慮三處生中受一種樂，謂離生喜樂，離欲界惡，生喜樂故。第二靜慮三處生中受一種樂，名定生喜樂，從初禪定中生二禪喜樂故。第三靜慮三處生中受一種樂，名離喜妙樂，離第二禪喜，生第三禪樂，離喜之樂，名離喜妙樂。初靜慮中長時安住離生喜樂，第二靜慮長時離苦，第三靜慮長時受樂，故名樂生。

Regarding the threefold generation of bliss: within the three dhyānas across nine places of birth, they experience three kinds of bliss. First, among the three places of birth in the first dhyāna, they experience one kind of bliss, namely the joy and bliss born of separation, because joy and bliss arise from being separated from the evils of the desire realm. Among the three places of birth in the second dhyāna, they experience one kind of bliss named the joy and bliss born of absorption, because the joy and bliss of the second dhyāna arise from the meditative concentration of the first dhyāna. Among the three places of birth in the third dhyāna, they experience one kind of bliss named the exquisite bliss free from joy; separating from the joy of the second dhyāna, the bliss of the third dhyāna arises, and bliss free from joy is called exquisite bliss free from joy. In the first dhyāna they abide for a long time in joy and bliss born of separation; in the second dhyāna they are free from suffering for a long time; in the third dhyāna they experience bliss for a long time; hence it is called 'generation of bliss'.