大般涅槃經義記 2.80

2.80

噵言「云何得金剛身」，問其色因，亦不問果。此一云何通問兩事，下答護法因緣故得。復以何因得堅固力，對上力果問其得因，下文之中與身同答。「云何於經究竟到岸」問安樂因，此經宗顯常樂之果，常樂之果是經旨趣，名經彼岸，到經彼岸方得安樂。此經彼岸云何得到？下佛答之，受持此經名字功德便得到之，到之究極說為究竟。「願開微密廣為生說」問辯才因，準六卷經，此問稍隱，六卷經言「菩薩為眾生說法有幾種」，下佛答之，能說之德有其四種：自正、正他、能隨問答、善解因緣。所說之法有其三種，法身、解脫、摩訶波若。將彼驗此，此問略少。若具，應言願佛開微密，菩薩依此法，廣為眾生說。故下文中佛開三事令菩薩說，由為他說故得辯才。

Saying "How is the vajra body attained?" asks about the cause of form, likewise not asking about the fruit. This single "how" covers questions about two matters; below, the answer is that it is attained through the conditions of protecting the Dharma. "By what cause again is firm strength attained?" asks about the cause of attaining it in contrast to the fruit of strength above; in the text below, it is answered together with the body. "How does one ultimately reach the other shore in the sūtras?" asks about the cause of peace and bliss. This sūtra fundamentally reveals the fruit of permanence and bliss; the fruit of permanence and bliss is the essential purport of the sūtra, called the other shore of the sūtras, and only upon reaching the other shore of the sūtras does one attain peace and bliss. How does one reach the other shore of this sūtra? Below, the Buddha answers: by upholding the name and virtues of this sūtra, one immediately reaches it; reaching it to the utmost is said to be "ultimate." "May you open the subtle and secret and expound it widely for living beings" asks about the cause of eloquence. Relying on the six-fascicle sūtra, this question is somewhat implicit; the six-fascicle sūtra says: "How many kinds of ways does a bodhisattva preach the Dharma for sentient beings?" Below, the Buddha answers: the virtues of being able to preach are fourfold: being personally upright, rectifying others, being able to answer according to questions, and having good understanding of causes and conditions. The Dharmas preached are threefold: dharmakāya, liberation, and mahāprajñā. Comparing that with this, this question is somewhat abbreviated. If complete, it should say: "May the Buddha open the subtle and secret, and may bodhisattvas, relying on this Dharma, expound it widely for sentient beings." Therefore, in the text below the Buddha opens the three matters to let bodhisattvas preach them; because of preaching for others, they attain eloquence.