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.
Imperishable things are imitated by those that are involved in
change, e.g. earth and fire. For these also are ever active; for
they have their movement of themselves and in themselves. But the
other potencies, according to our previous discussion, are all
potencies for opposites; for that which can move another in this way
can also move it not in this way, i.e. if it acts according to a
rational formula; and the same non-rational potencies will produce
opposite results by their presence or absence.
If, then, there are any entities or substances such as the
dialecticians say the Ideas are, there must be something much more
scientific than science-itself and something more mobile than
movement-itself; for these will be more of the nature of
actualities, while science-itself and movement-itself are potencies
for these.
Obviously, then, actuality is prior both to potency and to every
principle of change.
9
That the actuality is also better and more valuable than the
good potency is evident from the following argument. Everything of
which we say that it can do something, is alike capable of contraries,
e.g. that of which we say that it can be well is the same as that
which can be ill, and has both potencies at once; for the same potency
is a potency of health and illness, of rest and motion, of building
and throwing down, of being built and being thrown down
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