Related:

• Answer a fool according to his folly. -- Old Testament -- Proverbs xxvi, 5
• Answer a fool according to his folly, lest he be wise in his own conceit. -- Proverbs, 26:5
• Wiser in his own conceit than seven men that can render a reason.
  -- Old Testament -- Proverbs xxvi, 16...
• Even a fool, when he holdeth his peace, is counted wise. -- Old Testament -- Proverbs xvii, 28
• Seest thou a man diligent in his business? He shall stand before king
  he shall not stand before mean men. -- Old Testament -- Proverbs xxii, 29...
• A wise man gets more use from his enemies than a fool from his friends. -- Balthasar Gracia
• If A fool persists in his folly he shall become wise. -- William Blake
• The wise man's eyes are in his head; but the fool walketh in darkne
  and I myself perceived also that one event happeneth to them all....
• The righteous hath hope in his death. -- Old Testament -- Proverbs xiv, 32