All of us face barriers - physical, financial, temporal - every day. Some are unquestionably real. But others are plainly artificial - expectations about how well a given system can function, or how much change is too much, or what kinds of behavior are acceptable. The next time you encounter such a barrier, imposed by people who lack your imagination and drive and creativity, think hard about ignoring it. Solving a problem is hard enough; it gets that much harder if you've decided beforehand it can't be done.
"It is the brain, not the heart or lungs, that is the vital organ," said the esteemed neurologist Roger Bannister, best know as the first human being to run the mile in less than four minutes.
-as excerpted from Dubner and Levitt's Think Like A Freak