成唯識論述記 3.71

3.71

述曰：由此無記方受熏故，如來第八無漏淨識，唯在因中曾所熏習，帶此舊種，非新受熏，以唯善故，違於善等，如沈香等故，此《攝論》無。簡與佛地同，說為不熏。熏時何過？違拒法故，有增減故，善圓滿故，有優劣故，不可受熏。若無記性及唯堅故，即是所熏，本識同時，想等五數及虛空等，應是所熏。

The Commentary states: Because only the neutral receives perfuming, the Tathāgata's eighth pure anāsrava consciousness carries these old seeds only as perfumed during the causal stage, and does not newly receive perfuming. Being exclusively wholesome, it conflicts with the wholesome and so on, just like aloeswood; hence this is not in the Mahāyānasaṃgraha. It is distinguished from being identical with the Buddha-stage, and is described as unperfumed. What fault would there be in its being perfumed? Because it would oppose and reject dharmas, because there would be increase and decrease, because the wholesome is consummate, and because there would be superior and inferior; hence it cannot receive perfuming. If it were the perfumed merely through having a neutral nature and staying firm, then the five mental factors such as ideation concomitant with the fundamental consciousness, as well as space and the like, should also be the perfumed.