Suffering is but another name for the teaching of experience, which is the parent of instruction and the schoolmaster of life.
HomerThe skin of the coward changes color all the time, he can't get a grip on himself, he can't sit still, he squats and rocks, shifting his weight from foot to foot, his heart racing, pounding inside the fellow's ribs, his teeth chattering. He dreads some grisly death. But the skin of a brave soldier never blanches. He's all control. Tense but no great fear.
Homer