瑜伽師地論略纂 9.23

9.23

論云「由即於此數修習故，便能棄捨令不出離第三靜慮，第三靜慮地中勝樂，是故說言由樂斷故」者，此中第三靜慮繫樂，繫縛行者令不出離第三靜慮，不能得彼上第四定。今數修習捨、念等，能棄捨此定樂也。

The treatise states: "Because one repeatedly cultivates this very [equanimity, and so forth], one is able to discard the superior pleasure of the stage of the third dhyāna, which prevented emancipation from the third dhyāna; therefore, it is said: 'because pleasure is abandoned.'" Here, the pleasure bound to the third dhyāna binds the practitioner, preventing emancipation from the third dhyāna so that one cannot attain that higher fourth absorption. Now, repeatedly cultivating equanimity, mindfulness, and so forth, one is able to discard this absorption's pleasure.