Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
If he denies that general questions [*](See III V. 12–16.) are the concern of oratory, he disagrees with me: but if they do concern rhetoric, that
Aristotle [*](Rhet. I. iii. 3. ) himself also by his tripartite division of oratory, into forensic, deliberative and demonstrative, practically brought everything into the orator's domain, since there is nothing that may not come up for treatment by one of these three kinds of rhetoric.
A very few critics have raised the question as to what may be the instrument of oratory. My definition of an instrument is that without which the material cannot be brought into the shape necessary for the effecting of our object. But it is not the art which requires an instrument, but the artist. Knowledge needs no instruments, for it may be complete although it produces nothing, but the artist must have them. The engraver cannot work without his chisel nor the painter without his brush. I shall therefore defer this question until I come to treat of the orator as distinct from his art.