大乘起信論義記 2.266

2.266

In the second, regarding the evolving consciousness, the phrase "relying on the stirring, it is able to perceive" means that relying on the stirring of the preceding karmic consciousness, it evolves into the mark of being able to perceive. The evolving consciousness has two [aspects]: if, stirred by avidyā, it evolves into being able to perceive, it resides in the fundamental consciousness; if, stirred by sense-objects, it evolves into being able to perceive, it resides in the empirical consciousness. The mark of evolving here refers to the first meaning.