text: "The wise man is self-sufficient." This phrase, my dear Lucilius, is incorrectly explained by many; for they withdraw the wise man from the world, and force him to dwell within his own skin. But we must mark with care what this sentence signifies and how far it applies; the wise man is sufficient unto himself for a happy existence, but not for mere existence. For he needs many helps towards mere existence; but for a happy existence he needs only a sound and upright soul, one that despises Fortune.