大般涅槃經義記 7.358

7.358

自下第四因前宣說涅槃寂樂，乘明佛等樂相差別。佛有二樂：滅離諸苦故有「寂樂」、證法適神故有「知樂」。實相世諦義通染淨，故有三樂：就生死法宣說實相則有受樂，就佛果德宣說實相則有寂樂及覺知樂。佛性體寂唯一寂樂，以未顯故無覺知樂，以當見故得菩提時亦有菩提覺知樂也。

Below is the fourth [point]: occasioned by the earlier declaration of the quiescent bliss of nirvāṇa, it takes the opportunity to clarify the distinctions in the characteristics of bliss among the Buddha and others. The Buddha has two blisses: because of having eliminated all suffering, there is the "bliss of quiescence"; because of having realized the Dharma to delight the spirit, there is the "bliss of awareness". The ultimate truth of the true mark extends in meaning to both defilement and purity, and therefore has three blisses: speaking of the true mark with respect to the dharmas of birth-and-death, there is the bliss of sensation; speaking of the true mark with respect to the fruitional virtues of the Buddha, there is the bliss of quiescence as well as the bliss of awareness. The substance of buddha-nature is quiescent and has only the single bliss of quiescence; because it is not yet manifested, it lacks the bliss of awareness; because it will be seen in the future, when obtaining bodhi it will also have the bodhi bliss of awareness.