Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
And assuredly the man who will best inspire such feelings in others is he who has first inspired them in himself. For however we strive to conceal it, insincerity will always betray itself, and there was never in any man so great eloquence as would not begin to stumble and hesitate so soon as his words ran counter to his inmost thoughts.
Now: a bad man cannot help speaking things other than he feels. On the other land, the good will never be at a loss for honourable words or fail to find matter full of virtue for utterance, since among his virtues practical wisdom will be one. And even though his
Therefore, let those that are young, or rather let all of us, whatever our age, since it is never too late to resolve to follow what is right, strive with all our hearts and devote all our efforts to the pursuit of virtue and eloquence; and perchance it may be granted to us to attain to the perfection that we seek. For since nature does not forbid the attainment of either, why should not someone succeed in attaining both together? And why should not each of us hope to be that happy man?
But if our powers are inadequate to such achievement, we shall still be the better for the double effort in proportion to the distance which we have advanced toward either goal. At any rate let us banish from our hearts the delusion that eloquence, the fairest of all things, can be combined with vice. The power of speaking is even to be accounted an evil when it is found in evil men; for it makes its possessors yet worse than they were before.