觀無量壽佛經疏 2.3

2.3

又就前序中復分為二：一、從如是我聞一句，名為證信序。二、從一時下至云何見極樂世界已來，正明發起序。

Furthermore, within the preceding preface, it is divided again into two: 1. From the single phrase "Thus have I heard", it is named the preface verifying faith. 2. From "At one time" down to "how might I see the World of Sukhāvatī?", this directly clarifies the preface of origin.