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11
Of things which change, some change in an accidental sense, like
that in which 'the musical' may be said to walk, and others are
said, without qualification, to change, because something in them
changes, i.e. the things that change in parts; the body becomes
healthy, because the eye does. 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
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