"Before April 1954, the common belief was that man was not physically capable of breaking the four-minute barrier—that he could not run a mile in less than four minutes. That was the belief. It had never been done. But here’s what happened: Roger Bannister came along; and he broke the four-minute barrier. Since that time, over 20,000 people have done it, including high school kids. What changed? They knew it had been done; and, because they knew it had been done, there was a new belief about this barrier—of this goal that was unreachable. Those 20,000 people got into a race believing and knowing it was possible; that they could do it. If someone has done it, then you can do it." - Les Brown