Related:

• Even a fool who keeps silent is considered wise; when he closes his lips, he is deemed intelligent.
  -- Proverbs 17:28...
• Even a fool, when he holdeth his peace, is counted wise. -- Old Testament -- Proverbs xvii, 28
• Even a fool is thought wise if he keeps silent, and discerning if he holds his tongue.
  Miscellaneous Prove...
• Answer a fool according to his folly, lest he be wise in his own conceit. -- Proverbs, 26:5
• He who belittles his neighbor lacks sense, but a man of understanding remains silent.
  -- Proverbs 11:12...
• If A fool persists in his folly he shall become wise. -- William Blake
• It is naught, it is naught, saith the buyer; but when he is gone his way, then he boasteth.
  -- Old Testament -- Proverbs xx, 14...
• If a fool would persist in his folly he would become wise. -- William Blake