And on this account thinking that one
ought to go and going are virtually simultaneous, unless there be
something else to hinder action. The organic parts are suitably
prepared by the affections, these again by desire, and desire by
imagination. Imagination in its turn depends either upon conception or
sense-perception. And the simultaneity and speed are due to the
natural correspondence of the active and passive.
However, that which first moves the animal organism must be
situate in a definite original. Now we have said that a joint is the
beginning of one part of a limb, the end of another. And so nature
employs it sometimes as one, sometimes as two. When movement arises
from a joint, one of the extreme points must remain at rest, and the
other be moved (for as we explained above the mover must support
itself against a point at rest); accordingly, in the case of the
elbow-joint, the last point of the forearm is moved but does not
move anything, while, in the flexion, one point of the elbow, which
lies in the whole forearm that is being moved, is moved, but there
must also be a point which is unmoved, and this is our meaning when we
speak of a point which is in potency one, but which becomes two in
actual exercise.
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