Thus, if we suppose that a boat is carried in one
direction by the current of a stream, and impelled by the wind in
the opposite with an equal force, so that its situation with respect
to the banks is not changed, we will readily admit that it remains
in the same place, although the whole superficies which surrounds it
is incessantly changing.
XVI. That a vacuum or space in which there is absolutely no body is
repugnant to reason.
With regard to a vacuum, in the philosophical sense of the term,
that is, a space in which there is no substance, it is evident that
such does not exist, seeing the extension of space or internal place
is not different from that of body. For since from this alone, that
a body has extension in length, breadth, and depth, we have reason
to conclude that it is a substance, it being absolutely
contradictory that nothing should possess extension, we ought to
form a similar inference regarding the space which is supposed void,
viz., that since there is extension in it there is necessarily also
substance.
XVII. That a vacuum in the ordinary use of the term does not
exclude all body.
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