俱舍論頌疏論本 25.19

25.19

利中後者，利謂不動羅漢有中、後二退，中謂未得退，後謂受用退，以利根故無已得退。鈍三者，鈍謂退法等五，此具有三退也。經言不動法退現法樂住者，約受用退，非餘二退，故無有退。

"The sharp have the middle and the last": "the sharp" refers to the unshakeable arhat, who has the middle and latter two kinds of falling away—the middle being falling away from what is yet unobtained, and the latter being falling away from enjoyment. Because of sharp faculties, there is no falling away from what has been obtained. "The dull have three": "the dull" refers to the five beginning with falling-away dharma, who possess all three kinds of falling away. When the sūtra says that one of unshakeable dharma falls away from abiding in ease in the present life, this is said in terms of falling away from enjoyment, not the other two kinds of falling away; hence there is no [actual] falling away.