淨名經集解關中疏 1.171

1.171

譬如有人欲於空地造立宮室隨意無閡　此二喻文二。此初喻菩薩因化眾生故有淨土。肇曰。淨土必因眾生。譬立室必因地。無地無眾生室土無以成。

"It is, for example, like a person who wishes to build a palace on an open ground: he can do so as he pleases without hindrance." This second part has two similes. This first compares the bodhisattva possessing a pure land through transforming sentient beings. Sengzhao says: "A pure land necessarily depends on sentient beings, just as building a palace necessarily depends on the ground. Without ground and without sentient beings, the palace and the land cannot be accomplished."