Related:

• Those who tell all they know cause little or no trouble.
  Only those who tell more than they know are troublemakers....
• Those who know, do not say; those who say, do not know.
• Those who talk don't know. Those who don't talk, know.
• Those who know the least know it the loudest.
• The world is divided into two groups. There are those who know, and those who don't know.
  Those who know, they're no problem. Those who don't know are also in two groups....
• Those who speak know nothing; Those who know are silent" These words, I am told, Were spoken by Lao-tzu.
  -- P Chu-i (772-846) How is it then, the poem ends; that one who knew, wrote so much?...
• Those of you who think you know it all upset those of us who do.
• Those who fought for it know the true taste of freedom!