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.g. the hot is capable only of heating, but the medical
art can produce both disease and health. The reason is that science is
a rational formula, and the same rational formula explains a thing and
its privation, only not in the same way; and in a sense it applies
to both, but in a sense it applies rather to the positive fact.
Therefore such sciences must deal with contraries, but with one in
virtue of their own nature and with the other not in virtue of their
nature; for the rational formula applies to one object in virtue of
that object's nature, and to the other, in a sense, accidentally.
For it is by denial and removal that it exhibits the contrary; for the
contrary is the primary privation, and this is the removal of the
positive term. Now since contraries do not occur in the same thing,
but science is a potency which depends on the possession of a rational
formula, and the soul possesses an originative source of movement;
therefore, while the wholesome produces only health and the
calorific only heat and the frigorific only cold, the scientific man
produces both the contrary effects. For the rational formula is one
which applies to both, though not in the same way, and it is in a soul
which possesses an originative source of movement; so that the soul
will start both processes from the same originative source, having
linked them up with the same thing. And so the things whose potency is
according to a rational formula act contrariwise to the things whose
potency is non-rational; for the products of the former are included
under one originative source, the rational formula
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