阿彌陀經疏 1.65

1.65

又舍利弗下，二、生者不退莊嚴。阿鞞跋致此翻不退轉，而不退有三：位、行、念也。通教初果以去齊羅漢位不退，七地行不退，八地念不退；別教以信、行、向對之，初地證念不退，向但修耳；圓教初信至七信位不退，八信以去行不退，初住證念不退。經云皆是，則義必該三。一生補處，即等覺也。彼國既壽長境勝，故於生身多至等覺。阿僧祇，翻無數。

From "Moreover, Śāriputra" onward, second, the adornment of non-retrogression among those born there. 'Avaivartika' translates here as 'non-retrogression.' Non-retrogression has three kinds: position, practice, and mindfulness. From the first fruit of the Common Teaching onward up to the arhat is non-retrogression of position; the seventh bhūmi is non-retrogression of practice; the eighth bhūmi is non-retrogression of mindfulness. In the Distinct Teaching, matching them with faith, practice, and dedication: the first bhūmi realizes non-retrogression of mindfulness, while dedication merely cultivates it. In the Perfect Teaching, from the first to the seventh stage of faith is non-retrogression of position; from the eighth stage of faith onward is non-retrogression of practice; the first abode realizes non-retrogression of mindfulness. When the sūtra says 'all are,' the meaning necessarily encompasses all three. 'Those in the position of succession in one lifetime' means equal enlightenment. Since that land has a long lifespan and supreme surroundings, many in their manifestation bodies reach equal enlightenment. 'Asaṃkhya' translates as 'innumerable.'