The experimenter who does not know what he is looking for will not understand what he finds

Science does not permit exceptions.

Understand that I'm at my best when it comes to proving a point, not only to show that I'm a better fighter and a better athlete at 40½ years old, but I'm at my best when I know I've got to beat the system again.

It is what we know already that often prevents us from learning

It's what we think we know that keeps us from learning.

We can learn nothing except by going from the known to the unknown.