When some people urged that it is impossible for man to live like the animals owing to the tenderness of his flesh and because he is naked and unprot… - Dio Chrysostom

Pleasure assails a man through each and every sense that he has; and while he must face and grapple with work, to pleasure he must give the widest berth possible and have none but unavoidable dealings with her. And herein the strongest man is indeed strongest, one might almost say, who can keep the farthest away from pleasures; for it is impossible to dwell with pleasure or even to dally with her for any length of time without being completely enslaved.

Should you be willing to read [Xenophon's Anabasis] very carefully you shall discover how ... to deceive one’s enemies to their harm and one’s friends to their advantage, and to speak the truth in a way that will not pain those who are needlessly disturbed by it.

If in the guise of philosophers, they [declaim speeches] with a view to their own profit and reputation, and not to improve you, that indeed is shocking. For it is as if a physician when visiting patients should disregard their treatment and their restoration to health, and should bring them flowers and courtesans and perfume.