Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
On the other hand, it is a most pernicious practice to rest content with a written statement of the case composed either by the litigant who betakes himself to an advocate because he finds that his own powers are not equal to the conduct of his case, or by some member of that class of legal advisers [*](Advocatus is here used in its original sense. By Quintilian's time it had come also to mean advocate, and is often so used by him elsewhere. ) who admit that they are incapable of pleading, and then proceed to take upon themselves the most difficult of all the tasks that confront the pleader. For if a man is capable of judging what should be said, what concealed, what avoided, altered or even invented, why should he not appear as orator himself, since he performs the far more difficult feat of making