Institutio Oratoria

The gestures of which I have thus far spoken are such as naturally proceed from us simultaneously with our words. But there are others which indicate things by means of mimicry. For example, you may suggest a sick man by mimicking the gesture of a doctor feeling the pulse, or a harpist by a movement of the hands as though they were plucking the strings. But this is a type of gesture which should be rigorously avoided in pleading.

For the orator should be as unlike a dancer as possible, and his gesture should be adapted rather to his thought than to his actual words, a practice which was indeed once upon a time even adopted by the more dignified performers on the stage. I should, therefore, permit him to direct his hand towards his body to indicate that he is speaking of himself, or to point it at some one else to whom he is alluding, together with other similar gestures which I need not mention. But, on the other hand, I would not allow him to use his hands to imitate attitudes or to illustrate anything he may chance to say.