Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
It was against the class of men who employed their glibness of speech for evil purposes that he directed his denunciations. Similarly Socrates thought it incompatible with his honour to
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make use of the speech which Lysias composed for his defence, although it was the usual practice in those days to write speeches for the parties concerned to speak in the courts on their own behalf, a device designed to circumvent the law which forbade the employment of advocates. Further the teachers of rhetoric were regarded by Plato as quite unsuited to their professed task. For they divorced rhetoric from justice and preferred plausibility to truth, as he states in the Phaedrus. [*](267 A, with special reference to Tisias and Gorgias.)