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Anaxarchus the Eudaemonist wrote well in his book On Sovereignty: Wide learning is both of great advantage and great disadvantage to its possessor. It benefits the person of skill, it damages the person who lightly says anything in any company. You must know the limits of the appropriate moment. That is the definition of wisdom. Those who make speeches at the wrong moment, even if they are full of sense, are not counted wise and have a reputation for folly.”
Quoted by Clement of Alexandria in the Stromateis, selected by Richard Gamble in The Great Tradition.