Institutio Oratoria

But it is surely the orator who will have the greatest mastery of all such departments of knowledge and the greatest power to express it in words. And if ever he had reached perfection, there would be no need to go to the schools of philosophy for the precepts of virtue. As things stand, it is occasionally necessary to have recourse to those authors who have, as I said above, usurped the better part of the art of oratory after its desertion by the orators and to demand back what is ours by right, not with a view to appropriating their discoveries, but to show them that they have appropriated what in truth belonged to others.