成唯識論述記 4.247

4.247

述曰：既無熏習，如何前後為種？若曾自類相熏、前念中有後種子，前可生後，既無熏習何得為因？無性《攝論》云：二念不俱有，故不得熏習，如前已破。量云：前心等不為後心等種；無熏習故；如瓦礫等。

The Commentary states: Since there is no perfuming, how could the earlier and later serve as seeds? If they had previously perfumed each other within their own category and the seed of the later existed within the earlier moment, the earlier could give rise to the later; but since there is no perfuming, how could it be the cause? Asvabhāva's *Mahāyānasaṃgraha[-upanibandhana]* says: Two moments do not exist simultaneously, and therefore perfuming cannot obtain, as already refuted above. The syllogism is: The earlier mind and so forth do not serve as seeds for the later mind and so forth; because there is no perfuming; just as with potsherds and rubble.