成唯識論述記 4.227

4.227

述曰：若唯無覆，善惡心時此即應斷。此義意言，許間斷故，如識自體事非可熏等，前已破故。而彼若言善、惡心時，此類不斷性是無記，具堅、無記義故可熏者，今非之云。

The Commentary states: If it is strictly non-obscured indeterminate, then at the time of a wholesome or unwholesome mind, this [category] should be interrupted. The meaning of this is: because it is accepted to have interruptions, just like the actual individual entity of consciousness is not something that can be perfumed, etc., as was already refuted before. But if they say that at the time of a wholesome or unwholesome mind, this category is uninterrupted and its nature is indeterminate, so having the meanings of firmness and indeterminacy it can be perfumed, we now refute it, saying: