金光明經文句記 5.82

5.82

初、依現文別對三身。空是法身者，經無「空」字，以其日月必依於空。又下文云「佛真法身猶如虛空」。是故疏以空、日、月三對於三身。空無明暗，日月共依，別喻法身體本周遍。日能破暗，別喻報身三惑盡淨。月能盈昃，別喻應身隨機勝劣。此之別對為下圓融而作張本耳。

First, matching the three bodies individually according to the present text. Space being the Dharmakāya: the character "space" is absent from the sūtra, but the sun and moon must rely upon space. Furthermore, a later passage states: "The Buddha's true Dharmakāya is like empty space." Therefore, the commentary uses the three of space, sun, and moon to correspond to the three bodies. Space lacks lightness and darkness, and the sun and moon both rely upon it, serving as an individual metaphor for the fundamental omnipresence of the substance of the Dharmakāya. The sun can dispel darkness, serving as an individual metaphor for the Saṃbhogakāya having completely purified the three delusions. The moon can wax and wane, serving as an individual metaphor for the Nirmāṇakāya's superiority or inferiority according with beings' capacities. This individual matching merely serves as a prelude to the subsequent perfect fusion.