Institutio Oratoria

But this conviction of mine goes further. For I do not merely assert that the ideal orator should be a good man, but I affirm that no man can be an orator unless he is a good man. For it is impossible to regard those men as gifted with intelligence who on being offered the choice between the two paths of virtue and of vice choose the latter, nor can we allow them prudence, when by the unforeseen issue of their own actions they render themselves liable not merely to the heaviest penalties of the laws, but to the inevitable torment of an evil conscience.

But if the view that a bad man is necessarily a fool is not merely held by philosolphers, but is the universal belief of ordinary men, the fool will most assuredly never become an orator. To this must be added the fact that the mind will not find leisure even for the study of the noblest of tasks, unless it first be free from vice. The reasons for this are, first, that vileness and virtue cannot jointly inhabit in the selfsame heart and that it is as impossible for one and the same mind to harbour good

and secondly, that if the intelligence is to be concentrated on such a vast subject as eloquence it must be free from all other distractions, among which must be included even those preoccupations which are free from blame. For it is only when it is free and self-possessed, with nothing to divert it or lure it elsewhere, that it will fix its attention solely on that goal, the attainment of which is the object of its preparations.