大乘百法明門論開宗義決 1.34

1.34

Regarding "the aggregates and so forth of the past and future are all non-existent": What that school asserts is that the past and future are not real, because they are distinct from present dharmas. If one were to say that the substances of dharmas across the three times are all real, their function should not exist only in the present. If that were not so, the function and the substance would have to be different. If different from the substance, it should not be called its function, just as form is different from sound and form is not the function of sound; therefore, present dharmas are real, while the past and future are devoid of substance.