The expression 'that which originates the movement' is
ambiguous: it may mean either (a) something which itself is unmoved or
(b) that which at once moves and is moved. Here that which moves
without itself being moved is the realizable good, that which at
once moves and is moved is the faculty of appetite (for that which
is influenced by appetite so far as it is actually so influenced is
set in movement, and appetite in the sense of actual appetite is a
kind of movement), while that which is in motion is the animal. The
instrument which appetite employs to produce movement is no longer
psychical but bodily: hence the examination of it falls within the
province of the functions common to body and soul. To state the matter
summarily at present, that which is the instrument in the production
of movement is to be found where a beginning and an end coincide as
e.g. in a ball and socket joint; for there the convex and the
concave sides are respectively an end and a beginning (that is why
while the one remains at rest, the other is moved): they are
separate in definition but not separable spatially. For everything
is moved by pushing and pulling. Hence just as in the case of a wheel,
so here there must be a point which remains at rest, and from that
point the movement must originate.
To sum up, then, and repeat what I have said, inasmuch as an
animal is capable of appetite it is capable of self-movement; it is
not capable of appetite without possessing imagination; and all
imagination is either (1) calculative or (2) sensitive.
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