瑜伽論記 8.487

8.487

滅想受定，名受斷樂者，景云：以依勝義行苦道理意識捨受是勝義行苦，住滅定時此勝義行苦暫時寂靜故名為樂，實無意識覺受斷樂。

Regarding 'the concentration of the cessation of ideation and feeling is called the bliss of the cessation of feeling': Jing says: "Because, in accordance with the principle of the suffering of conditioned existence in the ultimate truth, the feeling of equanimity of mental consciousness is the suffering of conditioned existence in the ultimate truth. When abiding in the concentration of cessation, this suffering of conditioned existence in the ultimate truth temporarily calms down, and therefore it is called bliss; in reality, there is no mental consciousness aware of the bliss of the cessation of feeling."