無量壽經優婆提舍願生偈註 2.14

2.14

何故言此？菩薩之法，常以晝三時夜三時禮十方一切諸佛，不必有願生意；今應常作願生意，故禮阿彌陀如來也。

Why is this said? The practice of bodhisattvas is constantly to worship all the Buddhas of the ten directions during the three periods of the day and the three periods of the night, without necessarily having the intention to aspire for rebirth; now one should constantly generate the intention to aspire for rebirth, and therefore one worships Amitābha Tathāgata.