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. For one kind is a potency of
being acted on, i.e. the originative source, in the very thing acted
on, of its being passively changed by another thing or by itself qua
other; and another kind is a state of insusceptibility to change for
the worse and to destruction by another thing or by the thing itself
qua other by virtue of an originative source of change. In all these
definitions is implied the formula if potency in the primary
sense.-And again these so-called potencies are potencies either of
merely acting or being acted on, or of acting or being acted on
well, so that even in the formulae of the latter the formulae of the
prior kinds of potency are somehow implied.
Obviously, then, in a sense the potency of acting and of being
acted on is one (for a thing may be 'capable' either because it can
itself be acted on or because something else can be acted on by it),
but in a sense the potencies are different. For the one is in the
thing acted on; it is because it contains a certain originative
source, and because even the matter is an originative source, that the
thing acted on is acted on, and one thing by one, another by
another; for that which is oily can be burnt, and that which yields in
a particular way can be crushed; and similarly in all other cases. But
the other potency is in the agent, e.g. heat and the art of building
are present, one in that which can produce heat and the other in the
man who can build
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