俱舍論記 25.61

25.61

「無退論者至不應為難」者，述經部宗。無退論者作如是說：無學身中諸無漏解脫皆名不動，無退動故。伏難云：若無學身中諸無漏法皆無退動，應六種姓皆名不動，如何別建立第六不動法？為通此伏難，故作如是言：然六姓中別立第六不動法者，約有漏定現法樂住，明六種姓前五有退，第六不退名為不動。不據無漏，如前通釋，不應為難。

"The proponents of non-falling-away... should not raise this objection" sets forth the Sautrāntika tenet. The proponents of non-falling-away speak thus: in the person of an aśaikṣa, all uncontaminated liberations are called immovable, because there is no falling away or agitation. A hidden objection states: If in the person of an aśaikṣa all uncontaminated dharmas are free from falling away and agitation, all six lineages should be called immovable; why separately establish the sixth as the immovable dharma? In order to resolve this hidden objection, they speak thus: However, the separate establishment of the sixth, the immovable dharma, among the six lineages is stated with respect to abiding in ease in the present life through contaminated concentration, explaining that of the six lineages, the first five are subject to falling away, while the sixth does not fall away and is called immovable. It does not refer to the uncontaminated; as explained above, one should not raise this objection.