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Aristotle - Metaphysics
Atec Февраль 16 2008 19:57:08
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.g. 'there is a not-white'. Further, none of the categories other
than substance can exist apart. And the early philosophers also in
practice testify to the primacy of substance; for it was of
substance that they sought the principles and elements and causes. The
thinkers of the present day tend to rank universals as substances (for
genera are universals, and these they tend to describe as principles
and substances, owing to the abstract nature of their inquiry); but
the thinkers of old ranked particular things as substances, e.g.
fire and earth, not what is common to both, body.
There are three kinds of substance-one that is sensible (of
which one subdivision is eternal and another is perishable; the latter
is recognized by all men, and includes e.g. plants and animals), of
which we must grasp the elements, whether one or many; and another
that is immovable, and this certain thinkers assert to be capable of
existing apart, some dividing it into two, others identifying the
Forms and the objects of mathematics, and others positing, of these
two, only the objects of mathematics. The former two kinds of
substance are the subject of physics (for they imply movement); but
the third kind belongs to another science, if there is no principle
common to it and to the other kinds.
2
Sensible substance is changeable. Now if change proceeds from
opposites or from intermediates, and not from all opposites (for the
voice is not-white, (but it does not therefore change to white)),
but from the contrary, there must be something underlying which
changes into the contrary state; for the contraries do not change
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