說無垢稱經疏 6.532

6.532

贊曰：二移階道。釋迦寶階，天帝使作。無動寶階，從地涌出。釋迦騰空往於忉利，三月坐夏，為報母恩。末夏將歸，天帝使大力鬼神為佛而作寶階，中道黃金、左道馬惱、右道水精，故名三道。彼土寶階，為令人天往來有為，故從地踴，亦不相違。天下人間，為見佛聞法；人上天處，為觀天帝宮城園苑，故須寶階。十方佛事，各不同故。彼雖淨土，亦現有彼輪圍山等。如極樂佛，亦有王城、父母妻子、魔王調達種種等故。

Commentary: (2) Moving the flights of stairways. Śākyamuni's precious stairways were caused to be made by the King of the Devas. Akṣobhya's precious stairways welled forth from the earth. Śākyamuni soared into empty space and went to Trāyastriṃśa to sit for the three-month summer retreat in order to repay his mother's kindness. At the end of the summer when he was about to return, the King of the Devas dispatched mighty spirits to make precious stairways for the Buddha: the central path of yellow gold, the left path of agate, and the right path of crystal; hence they are called the three flights. In that land, the precious stairways are for causing humans and devas to come and go in a conditioned manner, and thus they well forth from the earth; this also is not contradictory. Devas descend to the human realm to behold the Buddha and hear the Dharma; humans ascend to the celestial abodes to view the palaces, cities, and gardens of the King of the Devas; therefore precious stairways are needed. Because the Buddha activities of the ten directions are each different. Although that is a pure land, it also manifests those Cakravāḍa mountains and so forth. Just as the Buddha of Sukhāvatī also has royal cities, parents, wives, and children, Māra kings, Devadatta, and various others.