大般涅槃經義記 7.356

7.356

第二句中，「涅槃即是常、樂、我、淨」簡有異空。何故須簡？前說虛空無我、樂、淨，今說涅槃亦如虛空，懼畏世人取彼涅槃全同虛空，無我、樂、淨，故須簡之。簡之云何？空是無理，無我、樂、淨；涅槃果德體是有故，具足四義，是故說言涅槃即是常、樂、我、淨。

In the second phrase: "Nirvāṇa is precisely constancy, bliss, self, and purity" distinguishes existence to differentiate it from emptiness. Why must it be distinguished? Earlier it was said that space is without self, bliss, or purity, and now it is said that nirvāṇa is also like space; fearing that worldly people might take that nirvāṇa to be entirely identical to space, without self, bliss, or purity, it must therefore be distinguished. How is it distinguished? Emptiness is the absence of principle, lacking self, bliss, and purity; because the substance of the fruitional virtues of nirvāṇa is existent, it is fully endowed with the four meanings; therefore it is said that nirvāṇa is precisely constancy, bliss, self, and purity.