淨名經集解關中疏 1.161

1.161

"We only pray that the World-Honoured One will explain the practices of the pure land for the bodhisattvas." This is the second [part], asking about the cause. Sengzhao says: "As for that whereby a land is purified, how could mere decoration purify it? It must be due to practice; hence he asks for practice to be explained. Generally, practice must occur in the stage of learning. Therefore, this question by the bodhisattva is precisely the subtle purport of the Tathāgata's manifestation of the canopies, and the original intention behind Ratnarāśi's coming."