Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
to say that there is nothing not merely in oratory, but in all the tasks of life that is more important than sagacity and that without it all formal instruction is given in vain, while prudence unsupported by learning will accomplish more than learning unsupported by prudence. It is sagacity again that teaches us to adapt our speech to circumstances of time and place and to the persons with whom we are concerned. But since this topic covers a wide field and is intimately connected with eloquence itself, I shall reserve my treatment of it till I come to give instructions on the subject of appropriateness in speaking. [*]( In XI. i. cp. I. v. 1. )