觀無量壽佛經疏 3.175

3.175

二、從先當觀於一丈六已下，正明觀像以表真、想水以表地。此是如來教諸眾生易境轉心入觀。或在池水華上，或在寶宮寶閣內，或在寶林寶樹下，或在寶臺寶殿中，或在虛空寶雲華蓋之內。如是等處一一住心想之，皆作化佛想，為令機境相稱易得成故也。

Second, from “one should first contemplate a sixteen-foot [image]” onward, it directly explains contemplating an image to manifest the true, and visualizing water to manifest the ground. This is the Tathāgata teaching sentient beings to change the object and shift the mind to enter contemplation: either upon the flowers in the pond water, or within the jeweled palaces and jeweled pavilions, or beneath the jeweled groves and jeweled trees, or amidst the jeweled terraces and jeweled halls, or within the jeweled clouds and flower canopies in the sky. In such places, focusing the mind and visualizing each one, all are visualized as transformation Buddhas, so that the capacity and the object correspond, making accomplishment easy to achieve.