I grant that we shall not have to employ
dialectic with such minute attention to detail when
we are pleading in the courts as when we are
engaged in philosophical debate, since the orator's
duty is not merely to instruct, but also to move and
delight his audience; and to succeed in doing this
he needs a strength, impetuosity and grace as well.
For oratory is like a river: the current is stronger
when it flows within deep banks and with a mighty
flood, than when the waters are shallow and broken
by the pebbles that bar their way.