俱舍論疏 24.81

24.81

論「謂不還中至起煩惱退」，明利、鈍不同。學、無學異，具緣別也。

The passage of the treatise starting with "Namely, among non-returners... retrogression through arising defilements" clarifies the difference between sharp and dull [faculties]. The difference between trainees and those beyond training lies in the distinct conditions they possess.