"If we do not make mistakes, that means we're not trying enough new things."

Philip Knight
Founder of Nike

"Obstacles don't have to stop you. If you run into a wall, don't turn around and give up. Figure out how to climb it, go through it, or work around it."

Michael Jordan
American basketball player & entrepreneur

"There are no constraints on the human mind, no walls around the human spirit, no barriers to our progress except those we ourselves erect."

Ronald Reagan
Actor and 40th President of the United States