text: Marcus Agrippa, a great-souled man, the only person among those whom the civil wars raised to fame and power whose prosperity helped the state, used to say that he was greatly indebted to the proverb "Harmony makes small things grow; lack of harmony makes great things decay." He held that he himself became the best of brothers and the best of friends by virtue of this saying. And if proverbs of such a kind, when welcomed intimately into the soul, can mould this very soul, why cannot the department of philosophy which consists of such proverbs possess equal influence? Virtue depends partly upon training and partly upon practice; you must learn first, and then strengthen your learning by action. If this be true, not only do the doctrines of wisdom help us but the precepts also, which check and banish our emotions by a sort of official decree.