Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
But, while others besides
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orators may discover what is credible as well as persuasive, by adding the words in every subject he, to a greater extent than the others, concedes the fairest name in all the world to those who use their gifts as an incitement to crime . Plato makes Gorgias [*](Gorg. 454 B. ) say that he is a master of persuasion in the law-courts and other assemblies, and that his themes are justice and injustice, while in reply Socrates allows him the power of persuading, but not of teaching.