首楞嚴義疏注經 9.49

9.49

問：此有漏禪壽命有限，何得窮未來際耶？答：此約得定報壽長遠，動經劫數，云窮未來，非約報後所論也。又此善定雖是有漏，而能隨順妙修行者，依第四禪引發此定，熏無漏禪，修願智無諍邊際定也。下五那含亦依此定，起有漏、無漏雜修靜慮。若凡夫得更不進修，即許壽命有限；若聖人修，即得盡未來際。通此兩向，凡、聖同修也。

Question: This tainted dhyāna has a limited lifespan; how can it reach 'the end of future time'? Answer: This refers to the attainment of long-lasting retribution lifespans in concentration, moving through counts of kalpas, hence called 'the end of future time'; it is not discussed in terms of after the retribution. Furthermore, although this wholesome concentration is tainted, it can comply with wondrous cultivation: based on the fourth dhyāna, one elicits this concentration, perfuming untainted dhyāna, and cultivates the knowledge of aspirations, non-contention, and the border-limit concentration. The five anāgāmins below also rely on this concentration to give rise to the mixed cultivation of tainted and untainted dhyāna. If ordinary beings attain it and advance no further in cultivation, their lifespan is indeed allowed to be limited; if noble ones cultivate it, it reaches the end of future time. Extending in both directions, it is cultivated by both ordinary beings and noble ones.