大般涅槃經義記 6.144

6.144

次明悅樂，於中初明因喜生樂，「迦葉言」下對喜辯異，先問後辯。辯中四番：一約因別。二約果別，觀於生死，知已不受，所以生喜；觀大涅槃，知已定得，所以生樂。三就體別，下喜上樂。四約法別，有漏世共，離之生喜；無漏不共，得之生樂。餘者可知。「是名淨戒，非世間戒」就初以結。

Next, it clarifies pleasure, within which it first clarifies pleasure arising on account of joy; from "Kāśyapa said" downward, it explains the difference in contrast to joy, first asking and then explaining. In the explanation there are four turns: First, difference in terms of cause. Second, difference in terms of fruit: contemplating birth-and-death and knowing one will no longer undergo it, joy arises; contemplating Great Nirvāṇa and knowing one will definitely attain it, pleasure arises. Third, difference in terms of essence: joy is lower and pleasure is higher. Fourth, difference in terms of dharma: the defiled is shared with the world, and separating from it brings joy; the undefiled is not shared, and attaining it brings pleasure. The rest can be understood. "This is called pure precepts, not worldly precepts" concludes with respect to the first.