Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
The definition given by Chrysippus, who
Areus again defines it well as speaking according to the excellence of speech. Those who regard it as the science of political obligations, also exclude men of bad character from the title of orator, if by science they mean virtue, but restrict it overmuch by confining it to political problems. Albutius, a distinguished author and professor of rhetoric, agrees that rhetoric is the science of speaking well, but makes a mistake in imposing restrictions by the addition of the words on political questions and with credibility; with both of these restrictions I have already dealt.
Finally those critics who hold that the aim of rhetoric is to think and speak rightly, were on the correct track. These are practically all the most celebrated and most discussed definitions of rhetoric. It would be both irrelevant and beyond my power to deal with all. For I strongly disapprove of the custom which has come to prevail among writers of text-books of refusing to define anything in the same terms as have been employed by some previous writer. I will have nothing to do with such ostentation.