12
If the categories are classified as substance, quality, place,
acting or being acted on, relation, quantity, there must be three
kinds of movement-of quality, of quantity, of place. There is no
movement in respect of substance (because there is nothing contrary to
substance), nor of relation (for it is possible that if one of two
things in relation changes, the relative term which was true of the
other thing ceases to be true, though this other does not change at
all,-so that their movement is accidental), nor of agent and
patient, or mover and moved, because there is no movement of
movement nor generation of generation, nor, in general, change of
change. For there might be movement of movement in two senses; (1)
movement might be the subject moved, as a man is moved because he
changes from pale to dark,-so that on this showing movement, too,
may be either heated or cooled or change its place or increase. But
this is impossible; for change is not a subject. Or (2) some other
subject might change from change into some other form of existence
(e.g. a man from disease into health). But this also is not possible
except incidentally. For every movement is change from something
into something. (And so are generation and destruction; only, these
are changes into things opposed in certain ways while the other,
movement, is into things opposed in another way.) A thing changes,
then, at the same time from health into illness, and from this
change itself into another.
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