大乘百法明門論開宗義決 1.124

1.124

由此如來第八淨識唯帶舊種等者。既遮善染非是所熏。佛第八識唯是善故非所熏者。便有難言。若非所熏又非能熏。是則佛果應無種子。如何能生諸功德法。為通此難故云。淨識唯帶舊種非新受熏。

Regarding 'Because of this, the Tathāgata's eighth pure consciousness carries only old seeds,' and so forth: since wholesome and defiled [dharmas] are excluded from being perfumed, and the Buddha's eighth consciousness is exclusively wholesome and therefore not perfumed, an objection arises: 'If it is neither what is perfumed nor what can perfume, then the Buddha-fruition should lack seeds; how could it give rise to all wholesome qualities?' To resolve this objection, it is said: 'The pure consciousness carries only old seeds; it does not receive new perfuming.'