俱舍論記 26.143

26.143

「隨依何地至七地俗智」者，釋自、下地。俗智別緣雖是有漏，能修自、下。餘有漏法無別緣故，多分修自。又《婆沙》第四云「問：何故六地見道，上能修下，下不修上？答：上地法勝，現在前時則能修下。下地法劣，現在前時不能修上。如劣朝勝，非勝朝劣。此亦如是。」廣如彼釋。又《婆沙》一百六十八云「見道依下必不修上，以是初得道故。無漏依上必修下地，以自在不繫故。」

[The phrase] "In accordance with whatever level it is based on [...] conventional cognition of seven levels" explains one's own and lower levels. Although conventional cognition with a distinct object is sāsrava, it can cultivate its own and lower levels. Other sāsrava phenomena lack a distinct object, and therefore for the most part cultivate only their own level. Furthermore, the Mahāvibhāṣā, fascicle 4, states: "Question: Why is it that in the path of vision of the six levels, the higher can cultivate the lower, but the lower cannot cultivate the higher? Answer: The phenomena of higher levels are superior; when they become manifest, they can cultivate the lower. The phenomena of lower levels are inferior; when they become manifest, they cannot cultivate the higher. Just as an inferior pays court to a superior, but a superior does not pay court to an inferior, this likewise is the case." This is explained at length there. Furthermore, the Mahāvibhāṣā, fascicle 168, states: "The path of vision based on a lower level definitely does not cultivate a higher level, because it is the first attainment of the path. The anāsrava based on a higher level definitely cultivates the lower levels, because it has mastery and is unbonded."