Related:

• There are two rules for success: 1) Never tell everything you know. -- Roger H. Lincol
• 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
• Draw in the breath of life, and as you breathe, smile. -- Anon.
• Work like hell, tell everyone everything you know, close a deal with a handshake, and have fun.
  -- Harold "Doc" Edgerton, summing up his life's philosophy, shortly before dying at the age of 86....
• The two hardest things to handle in life are failure and success.
• The two hardest things to handle in life are failure & success.
• Fortis' Two Great Lies of Life 1) Money isn't everything.
  2) I'm only going to put it in a little way....
• The less some people know the more eager they are to tell you about it.