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. For
they both defined superficially and thought that the first subject
of which a given definition was predicable was the substance of the
thing defined, as if one supposed that 'double' and '2' were the same,
because 2 is the first thing of which 'double' is predicable. But
surely to be double and to be 2 are not the same; if they are, one
thing will be many-a consequence which they actually drew. From the
earlier philosophers, then, and from their successors we can learn
thus much.
6
After the systems we have named came the philosophy of Plato,
which in most respects followed these thinkers, but had
pecullarities that distinguished it from the philosophy of the
Italians. For, having in his youth first become familiar with Cratylus
and with the Heraclitean doctrines (that all sensible things are
ever in a state of flux and there is no knowledge about them), these
views he held even in later years. Socrates, however, was busying
himself about ethical matters and neglecting the world of nature as
a whole but seeking the universal in these ethical matters, and
fixed thought for the first time on definitions; Plato accepted his
teaching, but held that the problem applied not to sensible things but
to entities of another kind-for this reason, that the common
definition could not be a definition of any sensible thing, as they
were always changing
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