Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
There is another gesture not unlike
Again, there is the somewhat unusual gesture in which the hand is hollowed and raised well above the shoulder with a motion suggestive of exhortation. The tremulous motion now generally adopted by foreign schools is, however, fit only for the stage. I do not know why some persons disapprove of the movement of the fingers, with their tops converging, towards the mouth. For we do this when we are slightly surprised, and at times also employ it to express fear or entreaty when we are seized with sudden indignation.
Further, we sometimes clench the hand and press it to our breast when we are expressing regret or anger, an occasion when it is not unbecoming even to force the voice through the teeth in phrases such as
What shall I do now?
What would you do?To point at something with the thumb turned back is a gesture which is in general just, but is not, in my opinion, becoming to an orator.
Motion is generally divided into six kinds, but circular motion must be regarded as a seventh. The latter alone is faulty when applied to gesture. The remaining motions— that is, forward, to right or left and up or down—all have their significance, but the gesture is never directed to what lies behind us, though we do at