大般涅槃經義記 7.218

7.218

覺知樂中，先列其名，「非一切」下釋知為樂，先反後順，「以大樂」下將義顯體，成涅槃大。

In the bliss of awareness, it first lists its name; from "not all" downward explains knowing as bliss, first negatively and then positively; from "by great bliss" downward uses the meaning to reveal the substance, establishing the greatness of nirvāṇa.