瑜伽師地論略纂 3.23

3.23

Setting forth the correct doctrine has six aspects: first, being difficult to apprehend due to distance; second, being difficult to apprehend due to the four obstructions, which the preceding third chapter calls concealment, disappearing, overpowering, and magical deception; third, being difficult to apprehend due to subtlety, like atoms; fourth, being difficult to apprehend due to mental distraction, like the sphere of supernatural powers; fifth, being difficult to apprehend due to impaired faculties, like old age, blindness, or illness; sixth, being difficult to apprehend due to lack of knowledge, like lacking true knowledge or knowledge of others' minds. It is not that the nature of the effect exists previously in the cause and cannot be apprehended, because it is not subsumed under these six.