Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
The art of oratory, as taught by most authorities, and those the best, consists of five parts:- invention, arrangement, expression, memory, and delivery or action (the two latter terms being used synonymously). But all speech expressive of purpose involves also a subject and words.
If such expression is brief
It is for this reason that memory forms the fourth department. But a delivery, which is rendered unbecoming cither by voice or gesture, spoils everything and almost entirely destroys the effect of what is said. Delivery therefore must be assigned the fifth place.
Those (and Albutins is among them), who maintain that there are only three departments on the ground that memory and delivery (for which I shall give instructions in their proper place [*](Book II. claps. ii. and iii.) ) are given us by nature not by art, may be disregarded, although Thrasymachus held the same views as regards delivery.