HYL. I give up the point for the present, reserving still a right to
retract my opinion, in case I shall hereafter discover any false step in
my progress to it.

PHIL. That is a right you cannot be denied. Figures and extension being
despatched, we proceed next to MOTION. Can a real motion in any
external body be at the same time very swift and very slow?

HYL. It cannot.

PHIL. Is not the motion of a body swift in a reciprocal proportion to
the time it takes up in describing any given space? Thus a body that
describes a mile in an hour moves three times faster than it would in
case it described only a mile in three hours.

HYL. I agree with you.

PHIL. And is not time measured by the succession of ideas in our minds?

HYL. It is.

PHIL. And is it not possible ideas should succeed one another twice as
fast in your mind as they do in mine, or in that of some spirit of
another kind?

HYL. I own it.

PHIL. Consequently the same body may to another seem to perform its
motion over any space in half the time that it doth to you. And the same
reasoning will hold as to any other proportion: that is to say, according