俱舍論記 20.29

20.29

「第四所立至類亦應然」者，破第四師。此師所立前後相待，一世法中應有三世。謂過去世前剎那應名過去，後剎那應名未來，中剎那名為現在。未來三世類亦應然。現在世法雖一剎那，待後應名過去，待前應名未來，俱待應名現在。

Regarding "What is established by the fourth ... should also be analogous": this refutes the fourth master. Under what this master establishes through mutual relation of before and after, within the dharmas of a single period there should be all three periods. That is, in the past period, the preceding moment should be called past, the succeeding moment should be called future, and the middle moment should be called present. The three periods in the future should also be analogous. Although the dharma of the present period is a single moment, relative to what comes after it should be called past, relative to what comes before it should be called future, and relative to both it should be called present.