1. “Trying to predict the future based on research is like trying to drive a car by looking in the rear-view mirror.” (Marshall McLuhan)

2. “Prediction by analogy – creativity – is so pervasive we normally don’t notice it.” (Jeff Hawkins)

3. “Prediction is very difficult, especially if it’s about the future.” (Niels Bohr)

4. “The only relevant test of the validity of a hypothesis is comparison of prediction with experience.” (Milton Friedman)

5. “Economists give their predictions to a digit after the decimal point to show that they have a sense of humor.” (Anon)

Borrowed with pride from all over the place.