俱舍論疏 13.3

13.3

It is named "karma" due to three meanings: first, activity; second, maintaining the models of Dharma; third, differentiating fruits. First, "activity" means that activity itself is called karma. "Maintaining the models of Dharma" means being able to maintain the Dharma models of the seven assemblies. "Differentiating fruits" means being able to differentiate desirable and undesirable fruits. Because this chapter clarifies it extensively, it is named "Exposition." As for why it follows the Chapter on the World: the Chapter on the World clarifies the differences between internal and external fruits. The causes upon which fruits depend are karma and defilement; defilement is general and karma is specific, hence karma is clarified first.