維摩義記 2.43

2.43

Question: If being born for one lifetime in heaven and later born in the human realm to attain Buddhahood is called "one lifetime", then for a srotāpanna who is born once in heaven and once in the human realm to enter nirvāṇa, into how many lifetimes of the fourteen lifetimes is this included? Explanation: Among these fourteen lifetimes, this is called two lifetimes. If that is so, Maitreya should also be the same as that; how can one say "one"? Explanation: They ought to be equal, yet are spoken of differently because what they are viewed in relation to is not the same. That srotāpanna is viewed in relation to the nirvāṇa with remainder upon the exhaustion of the body; therefore, receiving two bodies constitutes two lifetimes. In the case of Maitreya and others, they are viewed in relation to the Buddha-body; the subsequent birth in the human realm is the Buddha-body itself, and in contrast to that body, only that single recompense in Tuṣita is specifically called "one".