釋淨土群疑論 2.38

2.38

問曰：願生淨土諸修行者，或持一日一夜齋戒，或復孝養二親。此業如不願往生，即感人天之報。閻浮上壽，不越百年；天即六欲，上壽極多萬六千歲。今即迴斯戒行願生西方，如何以此善因，壽命無量無邊阿僧祇劫？戒因無別、勝劣不殊，壽報短長延促懸隔也。

Question: The practitioners who vow to be reborn in the pure land either uphold the purificatory precepts for one day and one night, or are filial to their two parents. If they do not vow to be reborn [in the pure land], this karma brings the retribution of humans or gods. The maximum lifespan in Jambudvīpa does not exceed one hundred years; as for the heavens, in the six [heavens of] desire, the maximum lifespan is at most sixteen thousand years. Now, if they dedicate this practice of precepts and vow to be reborn in the West, how can they, through this good cause, attain a lifespan of immeasurable, boundless asaṃkhyeya kalpas? Since the causal precept is not different, and there is no difference in its superiority or inferiority, how can the duration of the life retribution—its extension or shortness—be so vastly separated?