Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
With regard to manificence of language, deliblerative declaimers should avoid straining after it more than others, but it comes to them more naturally. For there is a preference among those who invent such themes for selecting great personages, such as kings, princes, senators and peoples, while the theme itself
In actual deliberations the case is different, and consequently Theophrastus laid it down that in the deliberative class of oratory the language should as far as possible be free from all affectation: in stating this view he followed the authority of his instructor, although as a rule he is not afraid to differ from him. For Aristotle [*](Rhet. iii. 12. )
held that the demonstrative type of oratory was the best suited for writing and that the next best was forensic oratory: his reason for this view was that the first type is entirely concerned with display, while the second requires art, which will even be employed to deceive the audience, if expedience should so demand, whereas advice requires only truth and prudence.