法華玄論 2.72

2.72

答：欲例顯二身異也。大小二涅槃既異，大小二法身亦異。小乘五分法身是生滅無常身，大乘法身謂無生滅常身也。若此經明法身猶是無常者，亦應此經明涅槃不異小乘也。

Answer: One intends by analogy to reveal the difference between the two bodies. Since the two nirvāṇas, greater and lesser, are different, the two dharmakāyas, greater and lesser, are also different. The fivefold dharmakāya of the lesser vehicle is a body of arising, extinction, and impermanence; the Mahāyāna dharmakāya refers to an eternal body free of arising and extinction. If this sūtra explained that the dharmakāya is still impermanent, then this sūtra would also explain that nirvāṇa is not different from that of the lesser vehicle.