Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
As a result you will find that certain persons who show astonishing skill in philosophical debate, as soon as they quit the sphere of their quibbles, are as helpless in any case that demands more serious pleading as those small animals which, though nimble enough in a confined space, are easily captured in an open field.
Proceeding to moral philosophy or ethics, we may note that it at any rate is entirely suited to the orator. For vast as is the variety of cases (since in
Again in deliberative assemblies how can we advise a policy without raising the question of what is honourable? Nay, even the third department of oratory, which is concerned with the tasks of praise and denunciation, must without a doubt deal with questions of right and wrong.
For the orator will assuredly have much to say on such topics as justice, fortitude, abstinence, self-control and piety. But the good man, who has come to the knowledge of these things not by mere hearsay, as though they were just words and names for his tongue to employ, but has grasped the meaning of virtue and acquired a true feeling for it, will never be perplexed when he has to think out a problem, but will speak out truly what he knows.