That what we say is true, is plain from the
following facts. When the 'buildable', in so far as it is what we mean
by 'buildable', exists actually, it is being built, and this is the
process of building. Similarly with learning, healing, walking,
leaping, ageing, ripening. Movement takes when the complete reality
itself exists, and neither earlier nor later. The complete reality,
then, of that which exists potentially, when it is completely real and
actual, not qua itself, but qua movable, is movement. By qua I mean
this: bronze is potentially a statue; but yet it is not the complete
reality of bronze qua bronze that is movement. For it is not the
same thing to be bronze and to be a certain potency. If it were
absolutely the same in its definition, the complete reality of
bronze would have been a movement. But it is not the same. (This is
evident in the case of contraries; for to be capable of being well and
to be capable of being ill are not the same-for if they were, being
well and being ill would have been the same-it is that which underlies
and is healthy or diseased, whether it is moisture or blood, that is
one and the same.) And since it is not. the same, as colour and the
visible are not the same, it is the complete reality of the potential,
and as potential, that is movement. That it is this, and that movement
takes place when the complete reality itself exists, and neither
earlier nor later, is evident. For each thing is capable of being
sometimes actual, sometimes not, e.
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