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. For the act of
building is realized in the thing that is being built, and comes to
be, and is, at the same time as the house.
Where, then, the result is something apart from the exercise,
the actuality is in the thing that is being made, e.g. the act of
building is in the thing that is being built and that of weaving in
the thing that is being woven, and similarly in all other cases, and
in general the movement is in the thing that is being moved; but where
there is no product apart from the actuality, the actuality is present
in the agents, e.g. the act of seeing is in the seeing subject and
that of theorizing in the theorizing subject and the life is in the
soul (and therefore well-being also; for it is a certain kind of
life).
Obviously, therefore, the substance or form is actuality.
According to this argument, then, it is obvious that actuality is
prior in substantial being to potency; and as we have said, one
actuality always precedes another in time right back to the
actuality of the eternal prime mover.
But (b) actuality is prior in a stricter sense also; for eternal
things are prior in substance to perishable things, and no eternal
thing exists potentially. The reason is this. Every potency is at
one and the same time a potency of the opposite; for, while that which
is not capable of being present in a subject cannot be present,
everything that is capable of being may possibly not be actual
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