俱舍論記 24.47

24.47

「且總成三至根差別故」者，此即別明三種不還。且總成三。由造作增長順起業故名為中般。中有名起，對向當生暫時起故，如前已說。由造作增長順生業故名為生般，由造作增長順後業故名為上流。如其次第配釋三種，或如其次第中般下品、生般中品、上流上品，煩惱現行有差別故分為三種。及中般上根、生般中根、上流下根，有差別故分為三種。

Regarding “First, generally forming three [...] due to the differences in faculties”: this separately clarifies the three kinds of non-returners. First, generally forming three: due to performing and accumulating karma to be experienced in intermediate existence (upapatti-vedanīya / antarābhava-vedanīya), one is called an intermediate-attainer. Intermediate existence is called ‘arising’ (udaya) because it arises temporarily toward the future rebirth, as has been said before. Due to performing and accumulating karma to be experienced upon rebirth, one is called an at-rebirth-attainer; due to performing and accumulating karma to be experienced in subsequent lives (aparaparyāya-vedanīya), one is called an upward-streamer. These are matched and explained according to the three kinds in proper order; or according to their order, intermediate-attainers have weak afflictions, at-rebirth-attainers have medium afflictions, and upward-streamers have strong afflictions active; thus they are divided into three kinds due to differences in the active functioning of afflictions. Also, intermediate-attainers have sharp faculties, at-rebirth-attainers have medium faculties, and upward-streamers have dull faculties; thus they are divided into three kinds due to differences [in faculties].