成唯識論演祕 3.371

3.371

此亦無違，業力所變內身外器必定同地，若定等力變自內身即不決定，下能引上天眼、耳故。變器、他身此一向定，言變身器不定等者，言總意別，不言身器皆有不定。疏說：上界起通來下，令下得見，名因通者，依他通故，此定不然，上界來下作欲界化，下所見者即自地故。

This also does not conflict: what is transformed by the force of karma—the internal body and external vessel—is necessarily of the same plane; but if it is transformed by the power of meditative concentration and the like, one's own internal body is then not determinate, because a lower [plane] can induce the upper divine eye and ear. Transforming the vessel and another's body is strictly determinate. As for the statement that transforming body and vessel is indeterminate and so forth, the expression is general but the intended meaning is distinct; it does not say that both body and vessel are indeterminate. The Commentary says that when someone of an upper realm gives rise to supernormal powers and comes down below to cause those below to see, this is called 'by cause of supernormal power' because it relies on the other's supernormal power; but this is definitely not so, because when one from an upper realm comes below, they produce an apparition of the desire realm, so what is seen below is of their own plane.