俱舍論疏 28.112

28.112

論「不可喜樂至及四支故」，遮轉計也。若言喜、樂更互現前說是樂受，有樂之時即無喜受，如何說具四支、五支？

On the treatise passage: "It is not admissible that joy and pleasure [...] and having four factors": this refutes an alternative proposition. If one says that joy and pleasure become manifest alternately and that is called pleasurable feeling, then when pleasure is present there is no joy-feeling; how then could it be said to possess four factors or five factors?