For when man is set before him and he says that
what is set there is 'a man' or 'an animal', he states its essence and
signifies a substance; but when a white colour is set before him and
he says that what is set there is 'white' or is 'a colour', he
states its essence and signifies a quality. Likewise, also, if a
magnitude of a cubit be set before him and he says that what is set
there is a magnitude of a cubit, he will be describing its essence and
signifying a quantity. Likewise, also, in the other cases: for each of
these kinds of predicate, if either it be asserted of itself, or its
genus be asserted of it, signifies an essence: if, on the other
hand, one kind of predicate is asserted of another kind, it does not
signify an essence, but a quantity or a quality or one of the other
kinds of predicate. Such, then, and so many, are the subjects on which
arguments take place, and the materials with which they start. How
we are to acquire them, and by what means we are to become well
supplied with them, falls next to be told.
10
First, then, a definition must be given of a 'dialectical
proposition' and a 'dialectical problem'.
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