俱舍論記 20.36

20.36

「已略推徵至此法性甚深」者，此即第二正破。上句「用」字通於兩處，謂何礙用、用云何。若用與體無有異者，世義便壞。若說去、來法體實有，誰未已生名未來？誰復已滅名過去？毘婆沙師作如是言：此法性甚深。

Regarding "Having briefly investigated ... this nature of dharmas is exceedingly profound": this is the second [part], the direct refutation. The word "activity" (kāritra) in the upper line applies to both places, meaning: what obstructs activity, and how does activity [exist]? If activity and substance are not distinct, the meaning of the periods of time is ruined. If it is said that the substances of past and future dharmas are substantially existent, what has not yet arisen would be called future, and what has already ceased would be called past? The Vaibhāṣikas make this statement: "This nature of dharmas is exceedingly profound."