大般涅槃經義記 2.114

2.114

第六段中，「以醍醐故加以水」者，為得常果，於生死中妄想建立，宣說梵天、自在天等以為常樂。

In the sixth section, "adding water for the sake of ghee" means that in order to obtain the eternal fruit, they falsely conceptualize and establish within birth and death, expounding Brahmā, Īśvara, and others as eternal and blissful.