觀無量壽佛經義疏 2.54

2.54

"'These three matters are called pure karma.' The Buddha told Vaidehī: 'Do you know now? These three kinds of karma are the correct causes for the pure karma of all Buddhas of the three times—past, future, and present.'" The fruitional virtues of the three times are accomplished by relying on these; hence they are called "the correct causes". Second, clarifying the correct contemplation, has four parts: first, commanding to listen and indicating the exposition; second, praising the request; third, exhorting and entrusting; fourth, showing the method. First, commanding to listen and indicating the exposition.