大般涅槃經義記 8.193

8.193

自下第三首楞為性，先廣辯相、後釋名義。前中四段：一明首楞是其佛性；二「一切眾生悉有」已下明諸眾生有而不見；三「首楞嚴有五名」下彰首楞嚴名別不同，顯首楞嚴即是佛性；四「一切眾生具三定」下還明眾生有而不見。就初段中，「性即首楞」會名顯示。兩名雖殊會體不別，是以言即。「性如醍醐」辯所即性。性通因果，因似乳酪、果如醍醐，性即首楞故須辯之。「即是一切諸佛母」者，彰性功能，成即首楞。首楞嚴者，此翻名為一切事竟。良以佛性是諸佛母，能生一切諸佛德，故得即首楞一切事竟。「首楞嚴故而令諸佛常樂我淨」彰首楞嚴三昧功能成即佛性。以首楞嚴能令諸佛常樂我淨，故即佛性佛母之義。

From here below is the third section, on the Śūraṅgama as the nature. First, it extensively distinguishes its characteristics, and then explains the meaning of the name. In the first part there are four sections: first, it explains that the Śūraṅgama is the buddha-nature; second, from "All sentient beings possess..." downward, it explains that sentient beings possess it but do not see it; third, from "The Śūraṅgama has five names" downward, it reveals the different names of the Śūraṅgama and shows that the Śūraṅgama is precisely the buddha-nature; fourth, from "All sentient beings are equipped with the three concentrations" downward, it again explains that sentient beings possess it but do not see it. In the first section, "the nature is precisely the Śūraṅgama" unites the names to reveal it: although the two names differ, when united, their essence is not distinct, which is why it says "is precisely." "The nature is like ghee" distinguishes the nature to which it is equated: nature pervades cause and fruit; the cause is like milk and curds, while the fruit is like ghee; because the nature is precisely the Śūraṅgama, this must be distinguished. "It is precisely the mother of all buddhas" reveals the function of the nature and establishes that it is precisely the Śūraṅgama. "Śūraṅgama" is translated here as "all matters accomplished." Because the buddha-nature is indeed the mother of all buddhas and can generate all the virtues of the buddhas, it can precisely be the Śūraṅgama's "all matters accomplished." "Because of the Śūraṅgama, all buddhas are made permanent, blissful, self, and pure" reveals the function of the Śūraṅgama Samādhi and establishes that it is precisely the buddha-nature. Because the Śūraṅgama can make all buddhas permanent, blissful, self, and pure, it is precisely the meaning of the buddha-nature being the mother of buddhas.