一切經音義 6.150

6.150

珊覩史多（上桑安反梵語也上方欲界中天名也古名兜率陀或云兜術皆訛略也唐云知足以下天多放逸上天多闇鈍受樂不進故云知足一生補處最後身菩薩多作此天王當來彌勒見今在彼天為王）。

珊覩史多: The first character is pronounced 桑 + 安 fanqie. Sanskrit; the name of the middle heaven in the upper Desire Realm. Anciently named Tuṣita (兜率陀) or Dōushù (兜術), both of which are corrupt and abbreviated. In the Tang language, it is called “Contentment.” Because the lower heavens are mostly heedless, and the upper heavens are mostly dull and indolent, receiving pleasures without advancing, it is called “Contentment.” Bodhisattvas of their final rebirth who are destined to succeed to Buddhahood in one lifetime mostly serve as the king of this heaven; the future Maitreya is currently the king in that heaven.