大般涅槃經義記 2.5

2.5

Below is the second [part], in response to what was requested above, promising to preach while refusing to abide. "I shall also first explain ambrosia for your sake" is the promise to preach; in contrast to the earlier promise to answer, it therefore says "shall also." Looking forward to entering extinction, it is called "first explain"; and thereafter entering nirvāṇa refuses their request to abide. Earlier, in the fifth request of the bhikṣus, it was said: "Show us the correct path of ambrosia," and therefore he promises to preach it for them; it was also said: "Abide long and do not enter nirvāṇa," and therefore he now refuses this.