觀無量壽佛經疏 3.53

3.53

First, from "Next one should visualize the water" downward, it generally presents the name of the contemplation, which takes up what preceded and introduces what follows. This explains that although the jeweled trees are exquisite, without pond water they could not yet be called fine. First, it is so the realm is not empty; second, it is to adorn the circumstantial retribution. For these meanings, there is this contemplation of the ponds and channels.