金光明最勝王經疏 6.78

6.78

解妨者，問：前〈壽量品〉，妙幢思惟：如來行長壽因，慈悲不害，云何命短唯八十年？前雖云壽無邊，未釋慈悲不害之行。今此三品正明此行，何非正宗？答：妙幢但疑行因應得長壽，不疑長壽由昔何因？此品又云「十千天子本願因緣今為汝說」，不云為說長壽因緣。又〈流水品〉云「由聞寶髻十二因緣聽聞此經，以此善根因緣今得授記。」不云由此得壽命長。故在流通，非正宗也。

Regarding resolving objections: Question: In the previous "Lifespan Chapter", Ruciraketu reflected: if the Tathāgata practiced the causes of long life with compassion and non-harming, why was his life short, only eighty years? Although it was previously stated that his lifespan is boundless, the practice of compassion and non-harming was not yet explained. Now these three chapters directly clarify this practice; why are they not the main body of the sūtra? Answer: Ruciraketu only doubted that practicing the cause should yield a long life, not what past causes a long life derived from. Furthermore, this chapter states, "I shall now explain for you the causes and conditions of the original vows of the ten thousand devaputras"; it does not say it explains the causes and conditions of a long lifespan. Moreover, the "Jalavāhana Chapter" states: "Due to hearing [the name of] Ratnaśikhin and the twelve links of dependent origination, and listening to this sūtra, through these causes and conditions of good roots they have now obtained their predictions." It does not say that from this they obtained a long life. Therefore, this belongs to the dissemination section, not the main body.