俱舍論疏 2.53

2.53

On the Śāstra's: "Vitarka at all times... because it is associated only with vicāra": this is the third part, clarifying vitarka. Wherever there is vitarka there is necessarily vicāra, so vitarka has only vicāra. Because there is no second vitarka, it is not called having vitarka. The meaning here is: when vicāra arises in the mental group, because there is no second vicāra, it does not associate [with itself]. Sensation and the like are also like this: although two or three sensations might belong to the same category, when one arises there is no second sensation or the like, and hence they do not associate with themselves. The Nyāyānusāra should not have used two sensations as a parallel; the Nyāyānusāra should be recorded as before.