Related:

• Answer a fool according to his folly. -- Old Testament -- Proverbs xxvi, 5
• As a dog returns to his vomit, so a fool returneth to his folly.
  Seest thou a man wise in his own conceit? There is more hope of a fool than of him....
• If A fool persists in his folly he shall become wise. -- William Blake
• Do not answer a fool according to his folly, or you will be like him yourself.
  Miscellaneous Proverb...
• If a fool would persist in his folly he would become wise. -- William Blake
• Even a fool, when he holdeth his peace, is counted wise. -- Old Testament -- Proverbs xvii, 28
• Wiser in his own conceit than seven men that can render a reason.
  -- Old Testament -- Proverbs xxvi, 16...
• Even a fool who keeps silent is considered wise; when he closes his lips, he is deemed intelligent.
  -- Proverbs 17:28...