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 the advantages conferred by reading and listening are not identical. The speaker stimulates us by the animation of his delivery, and kindles the imagination, not by presenting us with an elaborate
Moreover his voice, the grace of his gestures, the adaptation of his delivery (which is of supreme importance in oratory), and, in a word, all his excellences in combination, have their educative effect. In reading, on the other hand, the critical faculty is a surer guide, inasmuch as the listener's judgment is often swept away by his preference for a particular speaker, or by the applause of an enthusiastic audience.
For we are ashamed to disagree with them, and an unconscious modesty prevents us from ranking our own opinion above theirs, though all the time the taste of the majority is vicious, and the claque may praise even what does not really deserve approval.