Institutio Oratoria (1.pr.10-1.pr.12)

For I will not admit that the principles of upright and honourable living should, as some have held, be regarded as the peculiar concern of philosophy. The man who can really play his part as a citizen and is capable of meeting the demands both of public and private business, the man who can guide a state by his counsels, give it a firm basis by his legislation and purge its vices by his decisions as a judge, is assuredly no other than the orator of our quest.

Wherefore, although I admit I shall make use of certain of the principles laid down in philosophical textbooks, I would insist that such principles have a just claim to form part of the subject-matter of this work and do actually belong to the art of oratory.

I shall frequently be compelled to speak of such virtues as courage, justice, self-control; in fact scarcely a case comes up in which some one of these virtues is not involved; every one of them requires illustration and consequently makes a demand on the imagination and eloquence of the pleader. I ask you then, can there be any doubt that, wherever imaginative power and amplitude of diction are required, the orator has a specially important part to play?