Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
But eloquence cannot be confined even to these three forms of style. For just as the third style is intermediate between the grand and the plain style, so each of these three are separated by interspaces
For there are styles fuller or plainer than the plain, and gentler or more vehement than the vehement, while the gentler style itself may either rise to greater force or sink to milder tones. Thus we may discover almost countless species of styles, each differing from the other by some fine shade of difference. We may draw a parallel from the winds. It is generally accepted that there are four blowing from the four quarters of the globe, but we find there are also a large number of winds which he between these, called by a variety of names, and in certain cases confined to certain districts and river valleys.
The same thing may be noted in music. For after assigning five notes to the lyre, musicians fill up the intervals between the strings by a variety of notes, and between these again they interpose yet others, so that the original divisions admit of a number of gradations.
Eloquence has, therefore, a quantity of different aspects, but it is sheer folly to inquire which of these the orator should take as his model, since every species that is in itself correct has its use, and what is commonly called style of speaking does not depend on the orator. For he will use all styles, as circumstances may demand, and the choice will be determined not only by the case as a whole, but by the demands of the different portions of the case.
For just as he will not speak in the same way when he is defending a client on a capital charge and when he is speaking in a lawsuit concerned with an inheritance, or discussing interdicts and suits taking the form of a wager, [*](cp. I. x. 5 and IV. ii. 61. Sponsio (= wager) was a form of lawsuit in which the litigant promised to pay a certain sum of money if he lost his case. The intrdiet was an order issued by the praetor commanding or prohibiting certain action. ) or claims in connexion with
He will not maintain the same tone throughout his exordium, statement of fact, arguments, digression and peroration. He will speak gravely, severely, sharply, with vehemence, energy, fullness, bitterness, or geniality, quietly, simply, Hatteringly, gently, sweetly, briefy or wittily; he will not always be like himself, but he will never be unworthy of himself.