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15
Since substance is of two kinds, the concrete thing and the
formula (I mean that one kind of substance is the formula taken with
the matter, while another kind is the formula in its generality),
substances in the former sense are capable of destruction (for they
are capable also of generation), but there is no destruction of the
formula in the sense that it is ever in course of being destroyed (for
there is no generation of it either; the being of house is not
generated, but only the being of this house), but without generation
and destruction formulae are and are not; for it has been shown that
no one begets nor makes these. For this reason, also, there is neither
definition of nor demonstration about sensible individual
substances, because they have matter whose nature is such that they
are capable both of being and of not being; for which reason all the
individual instances of them are destructible. If then demonstration
is of necessary truths and definition is a scientific process, and if,
just as knowledge cannot be sometimes knowledge and sometimes
ignorance, but the state which varies thus is opinion, so too
demonstration and definition cannot vary thus, but it is opinion
that deals with that which can be otherwise than as it is, clearly
there can neither be definition of nor demonstration about sensible
individuals. For perishing things are obscure to those who have the
relevant knowledge, when they have passed from our perception; and
though the formulae remain in the soul unchanged, there will no longer
be either definition or demonstration
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