成唯識論述記 7.233

7.233

述曰：即眼等也。行相麁動者，麁者，唯取外境；動者，浮囂之義。又麁者行相易知，動者由緣外境，數加轉易，乃至佛果五識勢與因同。所藉眾緣，如前已說。時多不具，以緣多難辨故，不可恒具故，起時少，不起時多。

The Commentary states: These are the eye consciousness, and so forth. “Their modes of activity are coarse and fluctuating”: “coarse” means taking only external objects; “fluctuating” has the meaning of being unsteady and clamorous. Furthermore, “coarse” means that their modes of activity are easy to recognize; “fluctuating” means that due to conditioning external objects, they frequently change and shift. Even in the fruit of Buddhahood, the momentum of the five consciousnesses is the same as in the causal stage. The manifold conditions they rely upon have already been explained above. For the most part, these conditions are incomplete; because the conditions are manifold and difficult to assemble, and cannot be constantly complete, the times when they arise are few, and the times when they do not arise are many.