觀無量壽佛經疏 3.56

3.56

四、從一一水中下，至尋樹上下已來，正明水有不思議用。即有其五。一明別指渠名顯彼莊嚴之相。二明渠內寶華多少。三明華量大小。四明摩尼寶水流注華間。五明寶水從渠而出尋諸寶樹上下無礙。故名如意水也。

Fourth, from "In each water" down to "flowing up and down along the trees," it directly explains that the water has inconceivable functions. There are five points: first, it explains indicating the name of the channels individually to reveal their adorned marks; second, it explains the number of jeweled flowers in the channels; third, it explains the size of the flowers; fourth, it explains the maṇi jewel water flowing among the flowers; fifth, it explains that the jeweled water flows out of the channels and runs up and down along the jeweled trees without obstruction. Therefore it is called "wish-fulfilling water."