Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
For despite their greatness they are still but mortal men, and it will sometimes happen that their reader assumes that anything which he finds in them may be taken as a canon of style, with the result that he imitates their defects (and it is always easier to do this than to imitate their excellences) and thinks himself a perfect replica if he succeeds in copying the blemishes of great men.
But modesty and circumspection are required in pronouncing judgment on such great men, since there is always the risk of falling into the common fault of condemning what one does not understand. And, if it is necessary to err on one side or the other, I should prefer that the reader should approve of everything than that he should disapprove of much.
Theophrastus [*](In one of his lost rhetorical treatises.) says that the reading of poets is of great service to the orator, and has rightly been followed in this view by many. For the poets will
We should, however, remember that the orator must not follow the poets in everything, more especially in their freedom of language and their license in the use of figures. Poetry has been compared to the oratory of display, and further aims solely at giving pleasure, which it seeks to secure by inventing what is not merely untrue, but sometimes even incredible.