He who lives by the crystal ball soon learns to eat ground glass.

Related:

• Never underestimate the power of a platitude. --
  Edgar R....
• An economist is a man who would marry Farrah Fawcett for her money.
  Edgar R....
• If you gave to forecast, forecast often. --
  Edgar R....
• There must be underinvestment in bulls- just look at the rate of return.
  Edgar R....
• When you know absolutely nothing about the topic, make your forecast by asking a carefully selected probability sample of 300 others who don't know the answer either.
  Edgar R....
• Ask five economists and you'll get five different explanations (six if one went to Harvard).
  Edgar R....