成唯識論述記 5.288

5.288

述曰：諸煩惱起必由無堪任，即惛沈也。囂動是掉舉，餘三可知。無起煩惱，無無堪任性，及非囂動者故。問：如定變化障，硬澁無堪任，即通三性法，善中豈有惛沈性耶？

The Commentary states: The arising of all afflictions must be due to unserviceability, which is torpor. Turbid agitation is restlessness; the remaining three can be understood. For there are none that give rise to afflictions without having the nature of unserviceability and without turbid agitation. Question: As with the obstruction to meditative absorption and supernormal powers, stiffness and unserviceability pervade dharmas of the three natures; could wholesome states contain the nature of torpor?