But there is something which is by
its own nature moved directly, and this is the essentially movable.
The same distinction is found in the case of the mover; for it
causes movement either in an accidental sense or in respect of a
part of itself or essentially. There is something that directly causes
movement; and there is something that is moved, also the time in which
it is moved, and that from which and that into which it is moved.
But the forms and the affections and the place, which are the
terminals of the movement of moving things, are unmovable, e.g.
knowledge or heat; it is not heat that is a movement, but heating.
Change which is not accidental is found not in all things, but between
contraries, and their intermediates, and between contradictories. We
may convince ourselves of this by induction.
That which changes changes either from positive into positive,
or from negative into negative, or from positive into negative, or
from negative into positive. (By positive I mean that which is
expressed by an affirmative term.) Therefore there must be three
changes; that from negative into negative is not change, because
(since the terms are neither contraries nor contradictories) there
is no opposition. The change from the negative into the positive which
is its contradictory is generation-absolute change absolute
generation, and partial change partial generation; and the change from
positive to negative is destruction-absolute change absolute
destruction, and partial change partial destruction.
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