Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
Imagine for example that a skilful commander, without whose aid the state cannot hope to crush its enemies, is labouring under a charge which is obviously true: will not the common interest irresistibly summon our orator to defend him? We know at any rate that Fabricius publicly voted for and secured the election to the consulate of Cornelius Rufinus,
I might produce many other similar examples, but one of them taken at random is enough. For my purpose is not to assert that such tasks will often be incumbent on the orator whom I desire to form, but merely to show that, in the event of his being compelled to take such action, it will not invalidate our definition of an orator as a
good man, skilled in speaking.