觀無量壽佛經疏 4.26

4.26

又一切行者，行住坐臥，三業所修，無問晝夜時節，常作此解，常作此想，故名迴向發願心。又言迴向者，生彼國已還起大悲，迴入生死教化眾生，亦名迴向也。三心既具，無行不成。願行既成若不生者，無有是處也。又此三心亦通攝定善之義，應知。

Furthermore, all practitioners, walking, standing, sitting, or lying down, in cultivating the three karmas, regardless of day, night, or season, should constantly form this understanding and constantly maintain this thought; therefore it is called the mind of pariṇāmanā and making vows. Moreover, 'pariṇāmanā' also means that after being born in that land, one turns back to give rise to great compassion, returning to enter birth-and-death to teach and transform sentient beings; this is also called pariṇāmanā. When the three minds are complete, no practice fails to be accomplished. When vows and practice are already accomplished, that one should fail to be reborn is impossible. Furthermore, it should be known that these three minds also comprehensively encompass the meaning of the meditative good.