金光明最勝王經疏 2.33

2.33

贊曰：變土淨方，有四：一舉能變人、二明變土量、三所變土相、四明香薰。問：此何佛變？答：一解是釋迦變，如《法華經》，化佛欲集，釋迦變故。一解是四佛變，亦如妙音將至此土預現華座等。二解此正。何以故？下放光現瑞令生愛樂皆四如來，故知淨土亦四佛變。言帝青瑠璃者，是天帝釋青琉璃寶，寶中勝故，故偏舉之。有漏情局、無漏心通，故廣博淨。由無分別智，故有帝青。雖妙幢舍淨如佛土，具五分香，釋文可知。

Commentary: Transforming the land and purifying the directions has four parts: 1. identifying the persons capable of transforming it; 2. clarifying the extent of the transformed land; 3. the characteristics of the transformed land; 4. clarifying the perfume's fumigation. Question: Which Buddha transformed this? Answer: One explanation is that Śākyamuni transformed it, just as in the Lotus Sūtra, when the transformation Buddhas were about to assemble, Śākyamuni transformed it. Another explanation is that the four Buddhas transformed it, just as when Gadgadasvara was about to arrive in this land, flower thrones and so forth were manifested in advance. The second explanation is correct. Why? Because below, emitting light and showing auspicious signs to produce delight are all done by the four Tathāgatas; therefore we know the pure land was also transformed by the four Buddhas. 'Indranīla lapis lazuli' is the blue lapis lazuli jewel of Śakra, lord of the devas; being supreme among jewels, it is specifically mentioned. Outflow-bearing sentiments are narrow, whereas the outflow-free mind is all-penetrating; hence it is vast and pure. Due to non-conceptual wisdom, there is indranīla. Although Ruciraketu's house was pure as a Buddha land, it possessed the five divisions of fragrance; the explanation of the text is easy to know.