D6: I have explained in IIIP18 S1 and S2 what I shall understand by an affect toward a future thing, a present one, and a past.

But here it should be noted in addition that just as we can distinctly imagine distance of place only up to a certain limit, so also we can distinctly imagine distance of time only up to a certain limit. I.e., we usually imagine all those objects which are more than 200 feet away from us, or whose distance from the place where we are surpasses what we can distinctly imagine, to be equally far from us; we therefore usually imagine them as if they were in the same plane; in the same way, we imagine to be equally far from the present all those objects whose time of existing we imagine to be separated from the present by an interval longer than that we are used to imagining distinctly; so we relate them, as it were, to one moment of time.