And the middle of the body must needs be
in potency one but in action more than one; for the limbs are moved
simultaneously from the original seat of movement, and when one is
at rest the other is moved. For example, in the line BAC, B is
moved, and A is the mover. There must, however, be a point at rest
if one is to move, the other to be moved. A (AE) then being one in
potency must be two in action, and so be a definite spatial
magnitude not a mathematical point. Again, C may be moved
simultaneously with B. Both the originals then in A must move and
be, and so there must be something other than them which moves but
is not moved. For otherwise, when the movement begins, the extremes,
i.e. the originals, in A would rest upon one another, like two men
putting themselves back to back and so moving their legs. There must
then be some one thing which moves both. This something is the soul,
distinct from the spatial magnitude just described and yet located
therein.
10
Although from the point of view of the definition of movement- a
definition which gives the cause- desire is the middle term or
cause, and desire moves being moved, still in the material animated
body there must be some material which itself moves being moved.
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