Related:

• Answer a fool according to his folly, lest he be wise in his own conceit. -- Proverbs, 26:5
• 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....
• Wiser in his own conceit than seven men that can render a reason.
  -- Old Testament -- Proverbs xxvi, 16...
• There is a lion in the way; a lion is in the streets. -- Old Testament -- Proverbs xxvi, 13
• Do not answer a fool according to his folly, or you will be like him yourself.
  Miscellaneous Proverb...
• Even a fool, when he holdeth his peace, is counted wise. -- Old Testament -- Proverbs xvii, 28
• As the bird by wandering, as the swallow by flying, so the curse causeless shall not come.
  -- Old Testament -- Proverbs xxvi, 2...
• Whoso diggeth a pit shall fall therein. -- Old Testament -- Proverbs xxvi, 27
• Every fool will be meddling. -- Old Testament -- Proverbs xx, 3