Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
The period must have at least two cola. The average number would appear to be four, but it often contains even more. According to Cicero, [*](Or. lxvi. 222. Cicero says hexcameters, not senarii. ) its length should be restricted to the equivalent of four senarii or to the compass of a single breath. It is further essential that it should complete the thought which it expresses. It must be clear and intelligible and must
Wherever it is essential to speak with force, energy and pugnacity, we shall make free use of commata and cola, since this is most effective, and our rhythmical structure must be so closely conformed to our matter, that violent themes should be expressed in violent rhythms to enable the audience to share the horror felt by the speaker.