Institutio Oratoria

Nor yet again must we adopt all the gestures and movements of the actor. Within certain limits the orator must be a master of both, but he must rigorously avoid staginess and all extravagance of facial expression, gesture and gait. For if an orator does command a certain art in such matters, its highest expression will be in the concealment of its existence. What then is the duty of the teacher whom we have borrowed from the stage?