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 experience shows that they are more likely to repent of their purpose, their promises are less to be relied on, and, if they do keep their promise, their evidence is easier to refute.