首楞嚴義疏注經 6.41

6.41

樂變化天、他化自在，名大自在。不樂異熟果，樂自樂他變為樂具而受用之，名大自在。然若止以化樂、他化二天所配，即攝義不盡，故從慈恩攝四天也。

The Heaven of Delighting in Transformations (Nirmāṇarati) and Mastery over Transformations by Others (Paranirmitavaśavartin) are called Maheśvara (Great Mastery). Not delighting in the fruit of maturation, but delighting in transforming implements of pleasure for one's own enjoyment or others' enjoyment and experiencing them, is called Maheśvara. However, if one only correlates this with the two heavens of Nirmāṇarati and Paranirmitavaśavartin, the intended meaning is not exhausted; therefore, following Ci'en, it subsumes the four heavens.