Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
For judges are not always enlightened and often have to be tricked to prevent them falling into error. Give me philosophers as judges, pack senates and assemblies with philosophers, and you will destroy the power of hatred, influence, prejudice and false witness; consequently there will be very little scope for eloquence whose value will lie almost entirely in its power to charm.
But if, as is
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the case, our hearers are fickle of mind, and truth is exposed to a host of perils, we must call in art to aid us in the fight and employ such means as will help our case. He who has been driven from the right road cannot be brought back to it save by a fresh detour.