釋氏要覽 3.385

3.385

僧祇律云。欲求寂滅樂。當學沙門法○涅槃經云。諸行無常。是生滅法。生滅滅已。寂滅為樂。論云。寂滅為樂者。若言滅法為樂者此義不然。何以故。為有現在滅是過去已滅法殘故。以有殘故非樂也。若滅現在生為樂者。此義不然。何以故。有未來生是現在生殘故。以有殘故非樂也。若言未來生是常者。此義不然。生必有滅故非樂也。若能令未來應生滅法而不得生乃可為樂耳。此為正義。

The Mahāsāṃghika Vinaya states: "If one wishes to seek the joy of extinction, one should train in the methods of the śramaṇa." The Mahāparinirvāṇa Sūtra says:
"All conditioned phenomena are impermanent;
This is the dharma of arising and ceasing.
When arising and ceasing have ceased,
Extinction is joy."
A treatise states: As for "extinction is joy," if one says that the cessation of dharmas is joy, this meaning is not so. Why is that? Because there is present cessation which is the residue of what has already ceased in the past; because there is residue, it is not joy. If one says that the cessation of present arising is joy, this meaning is not so. Why is that? Because there is future arising which is the residue of present arising; because there is residue, it is not joy. If one says that future arising is permanent, this meaning is not so; what arises must cease, and therefore it is not joy. Only if one can cause what should arise in the future, the dharmas of arising and ceasing, to be unable to arise—only that may be considered joy. This is the correct meaning.