大般涅槃經義記 6.399

6.399

下廣釋之，解初門中，先問、次釋。釋中，先舉所聞法體，「非有無」下就法廣明不聞聞義。前中，初言「謂深密藏」總以標舉，下別顯之，先舉佛性，次明三寶。「佛等無別」明三體同，「三寶常」等明三義門，此即菩提。下障涅槃，「諸佛畢竟不涅槃者」，不入灰盡滅身涅槃。「常不變」者，住大涅槃，不變易也。

Below, it explains them extensively. In explaining the first gate, it first questions and then explains. Within the explanation, it first brings forth the essence of the dharma that is heard; from "neither existent nor non-existent" downward, it broadly clarifies the meaning of "hearing what has not been heard" in terms of the dharma. Within the former, the initial phrase "meaning the profound secret treasury" provides a general heading, and below it reveals it individually: first citing buddha-nature, next clarifying the Three Jewels. "The Buddha and so forth are without distinction" clarifies that the three share the same essence. "The Three Jewels are eternal," etc., clarifies the three semantic approaches; this is bodhi. Below, it clarifies nirvāṇa: "the Buddhas ultimately do not enter nirvāṇa" means they do not enter the nirvāṇa of ashes, exhaustion, and destruction of the body. "Constant and unchanging" means abiding in the Great Nirvāṇa, without changing or altering.