Related:

• Two rules of success in life: 1. Don't tell people everything you know. -- Anon.
• 1) Never tell everything at once. -- Ken Venturi's Two Great Rules of Life
• There are two essential basic strategies for success in business: 1. Never reveal all you know
• Never tell a pawn the rules of chess.
• The three rules of international air travel: (1) Never fly on Aeroflot if you can possibly avoid it (this used to be Braniff or Aeroflot).
  (2) Never bet a whole lot of money on two little pairs unless you know *exactly* what you're doing....
• Listen to your intuition. It will tell you everything you need to know.
  -- Anthony J. D'Angelo, The College Blue Book...
• Where everything is bad it must be good to know the worst. -- Francis H. Bradley
• Everything you know is wrong!