成唯識論了義燈 7.37

7.37

西明四解，第二為正。正取無漏法爾種子簡異無性，故云殊勝，不可舉果位等名為六處。《善戒經》云謂陰界六處，故知六處是內六處。內六處中意根處攝無漏種子，是六處故，非遍六處皆能持種。亦不得云具顯果位內、外六處，外六處中不持種故，說因性故。

Of the four explanations by Ximing, the second is correct: it takes the anāsrava innate seeds as primary to distinguish them from the absence of gotra, hence they are called "excellent"; one cannot adduce the stage of fruition and so forth to name the six āyatanas. The Shanjie jing says they refer to the skandhas, dhātus, and six āyatanas; thus we know the six āyatanas are the internal six āyatanas. Among the internal six āyatanas, the mental faculty āyatana subsumes the anāsrava seeds; it is [one of] the six āyatanas, but it is not the case that all six āyatanas across the board can hold seeds. Nor can one say that it fully manifests the internal and external six āyatanas of the stage of fruition, because the external six āyatanas do not hold seeds, and because causal nature is what is spoken of.