"Before you heal someone, ask him if he’s willing to give up the things that make him sick." —Hippocrates

"If you accomplish something good with hard work, the labor passes quickly, but the good endures; if you do something shameful in pursuit of pleasure, the pleasure passes quickly, but the shame endures." —Musonius Rufus

"The essence of philosophy is that a man should so live that his happiness shall depend as little as possible on external things." —Epictetus

"The measure of a man is what he does with power." —Plato