成唯識論述記 6.606

6.606

述曰：下第四，疑。雖與慧俱與五見不俱起，見審決，疑猶豫，行相相返，故定不俱。簡擇猶豫可說慧俱，不審決故，不與見並。

The Commentary states: Below is the fourth, doubt. Although it coexists with prajñā, it does not arise together with the five views: a view judges decisively, whereas doubt vacillates; their aspects of activity are mutually opposed, and therefore they definitely do not coexist. When there is selection and vacillation, it can be said to coexist with prajñā; but because it does not judge decisively, it does not accompany views.