Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
We must also remember that Cicero [*](Or. 30 sq. ) thinks that not even 'Thucydidcs or Xenophon will be of much service to an orator, although he regards the style of the former as a veritable call to arms and considers that the latter was the mouthpiece of the Muses. It is, however, occasionally permissible to borrow the graces of history to embellish our digressions, provided always that we remember that in those portions of our speech which deal with the actual question at issue we require not the swelling thews of the athlete, but the wiry sinews of the soldier, and that the cloak of many colours which Demetrius of Phalerum [*](cp. § 80. ) was said to wear is but little suited to the dust and heat of the forum.
There is, it is true,
The fact that there is so much for which we must have recourse to the study of the philosophers is the fault of orators who have abandoned [*](cp. I Pref. 11. ) to them the fullest portion of their own task. The Stoics more especially discourse and argue with great keenness on what is just, honourable, expedient and the reverse, as well as on the problems of theology, while the Socratics give the future orator a first-rate preparation for forensic debates and the examination of witnesses.
But we must use the same critical caution in studying the philosophers that we require in reading history or poetry; that is to say, we must bear in mind that, even when we are dealing with the same subjects, there is a wide difference between forensic disputes and philosophical discussions, between the law-courts and the lecture-room, between the precepts of theory and the perils of the bar.