瑜伽論記 17.538

17.538

於中分二：初辨世俗道理，指如意地。謂未立賴耶已前，但五六識名依世俗，具立八識名依勝義，或依世俗門施設八識，名有體性，依勝義門八識一體，不相離故。

In this there are two parts: first, distinguishing the conventional principle, referring to it being like the mental stage. That is, before establishing the ālaya[-vijñāna], only the five and six consciousnesses are established according to convention; establishing all eight consciousnesses is according to ultimate truth. Or, relying on the gate of convention, establishing the eight consciousnesses is named having substantial nature; relying on the gate of ultimate truth, the eight consciousnesses are of one substance, because they are inseparable.