觀無量壽佛經義疏 2.87

2.87

「『作是觀者，名為正觀。』」言作是者，指前觀相，心境相稱、教行無違故。二、簡邪。

"‘Practicing this contemplation is called the correct contemplation.’" Saying "practicing this" refers to the preceding aspects of contemplation, because the mind and the object correspond, and teaching and practice do not conflict. Second, distinguishing the incorrect.