大般涅槃經義記 3.29

3.29

自下第四迦葉領解。「我今始知如來至處為無有盡」，重領向前解脫之處。向前廣辨解脫處中，迦葉領解如是涅槃是如來處，常不變易，故今重領。「我今始知如來至處為無有盡」，對昔不知名今為始，無盡猶前常住義也。「處若無盡，當知壽命亦無盡」者，領解脫德。法無盡故成人無盡，此即領上解脫德中如來無有生、老、病、死，名命無盡。

From here down is the fourth [section], Kāśyapa's expression of understanding. "I now for the first time know that the place to which the Tathāgata arrives is without end" reiterates his understanding of the aforementioned place of liberation. In the previous broad analysis of the place of liberation, Kāśyapa understood that such nirvāṇa is the place of the Tathāgata, permanent and unaltering, and therefore now reiterates it. "I now for the first time know that the place to which the Tathāgata arrives is without end": contrasting with former ignorance, it is called "now for the first time"; "without end" is identical to the previous meaning of "permanently abiding." "If the place is without end, one should know that his lifespan is also without end" expresses understanding of the virtues of liberation. Because the Dharma is without end, it brings the person to be without end; this reiterates the aforementioned virtue of liberation wherein the Tathāgata has no birth, aging, illness, or death, which is termed "lifespan without end."