Similarly, also, the same rule holds with pains, some of which we endure, and others we shun. But choice and avoidance are exercised according to knowledge; so that it is not pleasure that is the good thing, but knowledge by which we shall choose a pleasure at a certain time, and of a certain kind. Now the martyr chooses the pleasure that exists in prospect through the present pain. If pain is conceived as existing in thirst, and pleasure in drinking, the pain that has preceded becomes the efficient cause of pleasure. But evil cannot be the efficient cause of good. Neither, then, is the one thing nor the other evil. Simonides accordingly (as also Aristotle) writes, “that to be in good health is the best thing, and the second best thing is to be handsome, and the third best thing is to be rich without cheating.”