俱舍論記 22.97

22.97

「又彼所說至應知亦爾」者，第三破苦易脫生樂。又苦易脫樂覺乃生如易肩者，此身分位初易肩時實能生樂，乃至此身如是分位未滅已前必有樂生，滅則不爾。若異此者，此初位後時樂應轉增，苦漸微故。然久易時苦雖漸微而不生樂，故知樂受非是下苦。如是易脫身四威儀，於初易位生樂解勞，應知亦爾。

As for "Furthermore, what they say... should be known to be likewise": this is the third refutation, concerning the shifting of suffering producing pleasure. Furthermore, regarding their claim that an awareness of pleasure only arises upon the shifting of suffering, like shifting a load between shoulders: when this bodily state first shifts the load to the shoulder, it is truly able to produce pleasure, and up until the time before this bodily state ceases, pleasure will certainly arise; once it ceases, it is not so. If it were otherwise, after this initial stage pleasure should increasingly grow, because suffering gradually diminishes. However, when it has been shifted for a long time, although suffering gradually diminishes, pleasure does not arise; therefore it is known that pleasant feeling is not low suffering. Shifting the body's four postures in this way, where pleasure arises and weariness is dispelled at the initial stage of shifting, should be known to be likewise.