[7]
To this is added
the quibble that nothing that is based on art can
have existed before the art in question, whereas men
have always from time immemorial spoken in their
own defence or in denunciation of others: the
teaching of rhetoric as an art was, they say, a later
invention dating from about the time of Tisias and
Corax: oratory therefore existed before art and
consequently cannot be an art.
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