大般涅槃經義記 3.174

3.174

初言「復次義名質直」是其法身，身無邪曲故曰質直，「直名光明」是其波若，慧無闇障故名光明，「明名不劣」即是解脫，「名曰如來」是其佛寶。下重顯之，「明名智慧」辨波若體，「直名常住」彰法身義，常以身住，不隨時變，故曰質直。

The opening words, "Furthermore, meaning is named straightforward," is the dharmakāya, for the body is without crookedness, hence it is called straightforward; "straightforward is named luminosity" is prajñā, for wisdom has no dark obstacles, hence it is named luminosity; "luminosity is named non-inferior" is precisely liberation; "named the Tathāgata" is the Buddha Jewel. Below, it reveals them again: "luminosity is named wisdom" discriminates the essence of prajñā; "straightforward is named permanently abiding" reveals the meaning of the dharmakāya, for it permanently abides as the body and does not change with time, hence it is called straightforward.