大般涅槃經義記 7.204

7.204

上來一段明小異大，「常樂我淨乃名大」者彰大異小，自下第四廣釋前喻，釋之不盡，前十喻中但釋海、河、山、城、眾生及人六門，地、王、天、道四門不釋。王之大小辯城具顯，不勞更釋。就所釋中，皆初立喻，後約顯法。

The above section clarified how the lesser differs from the great. "Permanence, bliss, self, and purity are properly called great" reveals how the great differs from the lesser. From here below, the fourth [part] broadly explains the previous metaphors, but does not explain them exhaustively: among the previous ten metaphors, it only explains the six gates of the ocean, river, mountain, city, sentient beings, and person, while the four gates of earth, king, heaven, and road are not explained. The greatness and smallness of the king are fully revealed in the analysis of the city, so there is no need to explain them again. Within those explained, in each case it first establishes the metaphor, and afterward correlates it to reveal the dharma.