成唯識論了義燈 1.122

1.122

問：梵天來下，其事云何？解云：以下界色麁，不為上依，自變為上地，自身依之。即上地器，依下地器，為增上緣。問：既來下界，豈不緣下？如馬勝往上許緣上故？答：亦緣下。問：既爾，相分是何所收？答：上界所攝，以欲界無通果色故，准薩婆多即欲界攝，有通果故。

Question: When a Brahmā deva comes down [to the lower realm], what is the situation? It is explained that because the form of the lower realm is coarse and cannot serve as a support for the higher, he himself transforms [a body] belonging to the higher realm, and his own body relies upon it; thus the vessel world of the higher realm relies on the vessel world of the lower realm as an adhipatipratyaya. Question: Having come down to the lower realm, does he not cognize the lower? Just as Aśvajit, going to the higher, was conceded to cognize the higher? Answer: He also cognizes the lower. Question: If so, what subsumes the nimittabhāga? Answer: It is subsumed under the higher realm, because there is no form resulting from supernormal powers in the desire realm. According to the Sarvāstivādins, it is subsumed under the desire realm, because there is form resulting from supernormal powers.