Institutio Oratoria

Quintilian

Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.

There is no point in the whole speech where confusion of memory or loss of fluency has a worse effect,

v4-6 p.41
for a faulty exordium is like a face seamed with scars; and he who runs his ship ashore while leaving port is certainly the least efficient of pilots.

The length of the exordium will be determined by the case; simple cases require a short introduction only, longer exordia being best suited to cases which are complicated, suspect or unpopular. As for those who have laid it down as a law applying to all exordia that they should not be more than four sentences long, they are merely absurd. On the other hand undue length is equally to be avoided, lest the head should seem to have grown out of all proportion to the body and the judge should be wearied by that which ought to prepare him for what is to follow.