成唯識論述記 5.625

5.625

述曰：第二上座部救，胸中色物為其意根，非第七者。不然，意非色故，說七心界皆是心故，意識應無二分別故；如五識等依色根故。不言自性分別者，合有二解：一云，五識實有自性；二云，三種皆無。此隨彼語，如《瑜伽》第一抄，《對法》第二抄會，及下第七方可了知。

The Commentary states: The second is the Sthaviranikāya's defense, taking a physical object in the chest as its mental faculty, rather than the seventh consciousness. This is not so, because the mind is not physical matter, and because the seven mind-elements are all said to be mind, and because the mental consciousness would be devoid of the two kinds of conceptual discrimination; just as the five consciousnesses and the like rely on physical faculties. Not mentioning conceptual discrimination of self-nature allows two interpretations: one says that the five consciousnesses genuinely possess self-nature [discrimination]; the second says that they lack all three kinds. Following their words, this can only be fully understood according to the first note of the Yogācārabhūmi-śāstra, the reconciliation in the second note of the Abhidharmasamuccaya, and the seventh fascicle below.