俱舍論疏 20.48

20.48

論「又此作用至有餘作用」，重破也。若作用有名現在，無名去、來，此去、來、今由何作用？此釋頌上句下三字「用云何」也。「用」字兩向用，向上何礙用，向下用云何也。

On the Śāstra's statement: "Furthermore, this activity […] has another activity": this is a repeated refutation. If having activity is called present and lacking activity is called past and future, by what activity are past, future, and present established? This explains the three characters "how is activity [defined]?" at the end of the opening line of the verse. The character "activity" applies in two directions: pointing upward, it forms "what hinders activity"; pointing downward, it forms "how is activity [defined]?"