Institutio Oratoria

Quintilian

Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.

Still it is in the nature of things conceivable that just causes may lead two wise men to take different sides, since it is held that wise men may fight among themselves, provided that they do so at the bidding of reason. I will therefore reply to their criticisms in such a way that it will be clear that these arguments have no force even against those who concede the name of orator to persons of bad character. For rhetoric is not self-contradictory.

The conflict is

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between case and case, not between rhetoric and itself. And even if persons who have learned the same thing fight one another, that does not prove that what they have learned is not an art. Were that so, there could be no art of arms, since gladiators trained under the same master are often matched against each other;