金光明經文句記 2.369

2.369

初、大用不應。八十之壽是法界全體起應物大用，故不應以定短致疑。

First, the great function is not inappropriate. The lifespan of eighty years is the entire substance of the dharma-realm giving rise to the great function of responding to beings; therefore, one should not incur doubt by taking it as definitively short.