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 our modern orators cannot endure this and imagine that their art is wasted unless it obtrudes itself, whereas as a matter of fact the moment it is detected it ceases to be art. We are the slaves of applause and think it the goal of all our effort. And so we betray to the judges what we wish to display to the bystanders.
There is also a kind of repetition of the statement which the Greeks call ἐπιδιηγήσις. It belongs to declamation rather than forensic oratory, and was invented to enable the speaker (in view of the fact that the statement should be brief) to set forth his facts at greater length and with more profusion of ornament, as a means of exciting indignation or pity. I think that this should be done but rarely and that we should never go to the extent of repeating the statement in its entirety. For we can attain the same result by a repetition only of parts. Anyone, however, who desires to employ this form of repetition, should touch but lightly on the facts when making his statement and should content himself with merely indicating what was done, while promising to set forth how it was done more fully when the time comes for it.