成唯識論述記 4.221

4.221

述曰：此徵假也。類不能持內法實種；許無實故，無勝用故；如龜毛等。此中二因：一是假故；二無勝用故，如瓶、衣等定不能持內法種子。外種可然，麻衣是假許可持故。本宗說類是假，今言實者是設遮也。如《攝論》總有二種：一、識類，識家之流；二、剎那類，即無常之流。二皆假法，此假實徵。

The Commentary states: This investigates the conceptual. The category cannot hold the real seeds of internal dharmas; because it is accepted to be unreal, and because it lacks superior efficacy; like a turtle's hair and so forth. Here there are two reasons: first, because it is conceptual; second, because it lacks superior efficacy, just as a vase, clothing, and the like definitely cannot hold the seeds of internal dharmas. For external seeds it may be so, since hemp cloth is conceptual and is accepted as being able to hold [them]. Their own school says that the category is conceptual; here, speaking of it being real is a hypothetical refutation. As in the Mahāyānasaṃgraha, there are two kinds in total: 1. the category of consciousness, the stream of consciousness; 2. the category of the moment, that is, the stream of impermanence. Both are conceptual dharmas; this is the investigation of conceptual versus real.