Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
The question as to the origin of rhetoric need not keep us long. For who can doubt that mankind received the gift of speech from nature at its birth (for we can hardly go further back than that), while the usefulness of speech brought improvement and study, and finally method and exercise gave perfection?
I cannot understand why some hold that the elaboration of speech originated in the fact that
It was, then, nature that created speech, and observation that originated the art of speaking. Just as men discovered the art of medicine by observing that some things were healthy and some the reverse, so they observed that some things were useful and some useless in speaking, and noted them for imitation or avoidance, while they added certain other precepts according as their nature suggested. These observations were confirmed by experience and each man proceeded to teach what he knew.