金光明經玄義 2.24

2.24

二、引證者，〈序品〉云「如來遊於無量甚深法性」，〈鬼神品〉云「若入是經，即入法性如深法性」，二文既云深法性，即知簡異二乘菩薩所得法性也。〈空品〉云「故此尊經略而說之」，說於空即如也。〈讚佛品〉云「知有非有本性空寂」。當達此等皆體之異名，悉會入法性。法是軌則，性是不變，不變故常一，此常一法性諸佛軌則，故云法性為此經體也。

Second, citing proof: the 'Introduction' says, 'The Tathāgata roamed in the immeasurable, extremely profound dharmatā.' The 'Spirits Chapter' says, 'If one enters this sūtra, one enters dharmatā just as [one enters] deep dharmatā.' Since both passages say 'deep dharmatā', one knows that it is distinguished from the dharmatā attained by the two vehicles and bodhisattvas. The 'Chapter on Emptiness' says, 'Therefore this revered sūtra speaks of it in brief,' and speaking of emptiness is precisely suchness. The 'Chapter on Praising the Buddha' says, '[He] knows that existence is non-existent, originally and intrinsically empty and tranquil.' One must realise that these are all different names for the substance, and all converge into dharmatā. Dharma is a model, and nature is unchanging; because it is unchanging, it is eternally one. This eternally single dharmatā is the model of all buddhas; hence it is said that dharmatā is the substance of this sūtra.