大般涅槃經義記 2.212

2.212

下明解脫，文別有五：一明涅槃為解脫處、二「迦葉言：何等名涅槃」下就處開出解脫之德、三「是故解脫成無量」下結嘆顯勝、第四迦葉領解、第五如來結勸修學。初中有二：一舉昔偈請佛解釋，欲於其中辯出涅槃為解脫處；二「所言大者其性廣」下就處辯釋涅槃之相。前中先問，問中初先舉偈總問。「無所積聚」是八覺中少欲之行，未得不求；「於食知足」即知足行，已得節量。「如鳥飛空迹不可得」，是其第八不戲論行。鳥喻賢聖，空喻法性，證實離相難以相求，如鳥飛空迹不可尋。略舉此三，中間寂靜、精進、正念、禪定、智慧略而不舉。此偈意趣，後半為大涅槃解脫之處，是義云何？請佛釋之。「誰得」已下就人別問。

Below clarifies liberation. The text has five distinct sections: first, clarifying that nirvāṇa is the abode of liberation; second, from "Kāśyapa said: 'What is called nirvāṇa?'" onward, unfolding the virtues of liberation with respect to the abode; third, from "Therefore liberation becomes immeasurable..." onward, concluding with praise to reveal its superiority; fourth, Kāśyapa's comprehension; fifth, the Tathāgata concluding by exhorting them to cultivate and learn. In the first section, there are two parts: first, citing the former verse to ask the Buddha for an explanation, wishing thereby to determine that nirvāṇa is the abode of liberation; second, from "What is called great, its nature is vast..." onward, differentiating and explaining the characteristics of nirvāṇa with respect to the abode. In the former part, first is the question, wherein he first cites the verse to ask generally. "Having nothing accumulated" is the practice of having few desires among the eight awarenesses—not seeking what has not yet been attained; "knowing contentment in food" is the practice of knowing contentment—moderating what has already been attained. "Like a bird flying through the sky, its tracks cannot be found" is the eighth, the practice of non-proliferation. The bird is an analogy for the worthy and noble ones; the sky is an analogy for the nature of dharmas. Realizing the real and departing from marks, it is difficult to seek through marks, just as a bird flies through the sky and its tracks cannot be searched out. These three are briefly cited; those in between—quietude, vigor, right mindfulness, dhyāna, and wisdom—are omitted and not cited. The purport of this verse is that its latter half is the place of liberation in Great Nirvāṇa. What is the meaning of this? He requests the Buddha to explain it. From "Who attains..." onward, he asks specifically with respect to persons.