成唯識論掌中樞要 2.193

2.193

Uncontaminated seeds existing in consciousness, as well as uncontaminated five dusts existing internally—that is, matter of transformation—are all not taken as intentional objects by the eighth [consciousness]. It might be said that because there are uncontaminated five roots serving as the supports for the five consciousnesses, what fault is there if the eighth does not take them as intentional objects? The explanation says: If the five roots are real, the eighth must take them as intentional objects; if they are nominal, there is no need for the eighth to take matter as an intentional object. Seeds, matter, and so forth do not require the eighth to take them as intentional objects before they can establish real utility. Therefore, in the causal stage there are no uncontaminated five roots. Question: Matter and so forth may be so, but how can seeds be real seeds without the eighth taking them as intentional objects? Just as when associated mental factors and the sixth consciousness take them as intentional objects, they are not real seeds. Why is it not necessary that the eighth take them as intentional objects for there to be the utility of real seeds? This meaning should be reflected upon.