Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
By far the greatest influence is exercised by the glance. For it is by this that we express supplication, threats, flattery, sorrow, joy, pride or submission. It is on this that our audience hang, on this that they rivet their attention and their gaze, even before we begin to speak. It is this that inspires the hearer with affection or dislike, this that conveys a world of meaning and is often more eloquent than all our words.
Consequently in plays destined for the stage, the masters of the art of delivery design even their masks to enhance the emotional effect. Thus, in tragedy, Aerope will be