成唯識論述記 3.53

3.53

述曰：無性《攝大乘》第二卷說：如從其炭、牛糞、毛等，如次生巨勝、青蓮根及蒲。非巨勝等與炭等俱生俱滅，互相熏習而從彼生，名無熏習；如巨勝等與華等，俱生俱滅，由熏習故生香氣等，名有熏習。外種不定，內則定熏。故外種子既唯現行，為增上緣，辨所生果。

The Commentary states: The second fascicle of Asvabhāva's Mahāyānasaṃgraha states: Just as from charcoal, cow dung, and hair, there are produced in sequence sesame, blue lotus roots, and reeds. It is not that sesame and the like co-arise and co-cease with charcoal and the like, perfuming one another and being produced from them—this is called having no perfuming. Just as sesame and the like [arise] together with flowers and the like, co-arising and co-ceasing, and due to perfuming produce fragrance and the like—this is called having perfuming. External seeds are indefinite; internal ones are definitely perfumed. Therefore, since external seeds are only present actualities, they serve as sovereign conditions to distinguish the results produced.