Institutio Oratoria

Consequently all oratory involves a natural admixture of all these philosophic elements—at least, that is to say, all oratory that is worthy of the name. For mere garrulity that is ignorant of all such learning must needs go astray, since its guides are either non-existent or false. Physics [*](i.e. natural phlilosophy in the widest sense. ) on the other hand is far richer than the other branches of philosophy, if viewed from the standpoint of providing exercise in speaking, in proportion as a loftier inspiration is required to speak of things divine than of things human; and further it includes within its scope the whole of ethics, which as we have shown [*](§ 15.) are essential to the very existence of oratory.

For, if the world is governed by providence, it will certainly be the duty of all good men to bear their part in the administration of the state. If the origin of our souls be divine, we must win our way towards virtue and abjure the service of the lusts of our earthly body. Are not these themes which the orator will frequently be called upon to handle? Again there are questions concerned with auguries and oracles or any other religious topic (all of them subjects that have often given rise to the most important debates in the senate) on which the orator will have to