Institutio Oratoria

Those, again, who make ostentatious profession, as some do, of being philosophers, would do well to avoid most of the ornaments of oratory, more especially those which consist in appeals to the passions, which they regard as moral blemishes. So, too, the employment of rare words and of rhythmical structure are incongruous with their profession.

For

Rocks and solitudes answer to the voice,

For on you I call, ye hills and groves of Alba; I call you to bear me witness, and ye, too, fallen altars of the Albans, that were once the peers and equals of the holy places of Rome.

But the public man, who is truly wise and devotes himself not to idle disputations, but to the administration of the state, from which those who call themselves philosophers have withdrawn themselves afar, will gladly employ every method that may contribute to the end which he seeks to gain by his eloquence, although he will first form a clear conception in his mind as to what aims are honourable and what are not.