大般涅槃經義記 5.366

5.366

上來第二別明慈實，「悲若有無、非有無」下是第三段，就實嘆勝。於中有二：一嘆慈深；二「住涅槃修如是慈，雖復安於睡眠」已下明修利益。

The above is the second [part], specifically clarifying that loving-kindness is real; from 'Loving-kindness as either existing or non-existing, neither existing nor non-existing' downward is the third section, praising its superiority in terms of reality. Within this there are two: first, praising the depth of loving-kindness; second, from 'Abiding in nirvāṇa and cultivating such loving-kindness, even if resting in sleep' downward clarifies the benefits of cultivation.