觀無量壽佛經疏 4.14

4.14

Furthermore, one resolutely and deeply believes that Śākyamuni Buddha spoke in this Amitāyurdhyāna Sūtra of the three merits, nine grades, and the two goods of meditative and non-meditative [practices], witnessing and praising that Buddha's primary and circumstantial retributions to cause people to admire and yearn for them. Furthermore, one resolutely and deeply believes that in the Amitābha Sūtra, the Buddhas as numerous as the sands of the Ganges in the ten directions witness and urge, so that all ordinary people are certain to attain rebirth.