說無垢稱經疏 4.102

4.102

贊曰：下別顯理窮，初徵、後顯。顯中有二：初陳己事、後顯他詞。此徵及陳己事也。覩史多者，欲界六天中第四天也。此名知足，受諸欲樂，深知足故。由此根性，菩薩住中，以當生下。佛記彌勒，却後十二年，當於本處結跏趺坐，如入滅定入般涅槃，上生知足，紹隆補所。所以彼天多來瞻禮。慈氏已超退位，故隨所應，以四不退法輪之行，為彼天說，或唯為說八地以上第四不退法輪位法。

Commentary: Below, specifically revealing the exhaustion of reasoning. First, asking; then, revealing. In revealing, there are two parts: first, presenting his own affair; second, revealing the other's words. This asks and presents his own affair. Tuṣita is the fourth heaven among the six heavens of the desire realm. It is named 'contentment', because while enjoying various desire pleasures, they are deeply content. Due to this disposition, the bodhisattva dwells in it before being born below. The Buddha prophesied of Maitreya that after twelve years, he would sit cross-legged in his original place, enter parinirvāṇa as if entering the cessation attainment, ascend to be born in Tuṣita, and succeed to the position [of Buddhahood]. Therefore, many from that heaven come to gaze upon and pay homage to him. Maitreya had already transcended the stage of retrogression; thus, according to what was appropriate, he preached to that heaven the practices of the four non-retrogressive wheels of Dharma, or solely preached the dharma of the fourth stage of the non-retrogressive wheel of Dharma for the eighth bhūmi and above.