大乘起信論義記 2.168

2.168

於中四句：一、橫顯業德廣多無量。二、竪顯業根深窮未來際。三、顯業勝能無功應機。四、顯業勝利益潤不虛。如此則是報化二身真如大用，無始無終相續不絕故。如《金光明經》云「應身者，從無始生死相續不斷故，一切諸佛不共之法能攝持故，眾生不盡、用亦不盡，故說常住。」《寶性論》云「何者成就自身利益？謂得解脫，遠離煩惱障、智障，得無障礙清淨法身，是名成就自身利益。何者成就他身利益？既得成就自身利已，無始世來自然依彼二種佛身，示現世間自在力行，是名成就他身利益。」

Within this, there are four lines: 1. Horizontally revealing that the virtues of the activity are vast, numerous, and immeasurable. 2. Vertically revealing that the root of the activity runs deep, exhausting the limits of the future. 3. Revealing that the superior capacity of the activity responds to capacities effortlessly. 4. Revealing that the superior benefit of the activity enriches without being in vain. In this manner, these are the great functions of tathatā of both the saṃbhogakāya and nirmāṇakāya, being continuous and uninterrupted without beginning or end. As the Suvarṇaprabhāsasūtra says: 'As for the nirmāṇakāya, because it is continuously uninterrupted from beginningless saṃsāra, and because it can maintain the qualities uncommon to all buddhas, so long as sentient beings are not exhausted its function is also not exhausted; therefore it is said to be permanently abiding.' The Ratnagotravibhāga says: 'What is accomplishing benefit for oneself? It means attaining liberation, leaving far behind the afflictive obscurations and cognitive obscurations, and attaining the unobstructed, pure dharmakāya; this is called accomplishing benefit for oneself. What is accomplishing benefit for others? Having attained the accomplishment of benefit for oneself, from beginningless ages naturally relying on those two kinds of buddha-bodies to manifest sovereign conduct in the world; this is called accomplishing benefit for others.'