Institutio Oratoria

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