大般涅槃經義記 6.291

6.291

下次就其能化人釋，於中先定三字之義。「言阿闍者名曰不生，其不生者是其涅槃」。「世名世法，為名不污」，為有何義得名不污？若佛在世自有愛著即名為污，為他處之故名不污。次將此義就佛辨釋，若佛在世為世八法之所染污，則須捨世疾入涅槃。以佛有世，世間八法不能污故，於無量劫常在世間不入涅槃。八法如上。「是故」下結。

Next, he explains in terms of the person capable of transforming, within which he first determines the meaning of the three words: "What is called 'Ajāta' means 'unborn'; that which is unborn is nirvāṇa." "'Śatru' means worldly dharmas, and 'for' means unstained." By what meaning does "for" acquire the sense of unstained? If the Buddha were in the world and possessed clinging attachment of his own, that would be called stained; because he dwells in it for the sake of others, it is called unstained. Next, he applies this meaning to the Buddha: if the Buddha while in the world were defiled by the eight worldly dharmas, he would have to abandon the world and swiftly enter nirvāṇa. Because the Buddha possesses the world yet the eight worldly dharmas cannot defile him, he constantly remains in the world for incalculable kalpas without entering nirvāṇa. The eight dharmas are as explained above. From "therefore" onward concludes.