Eric Weihenmayer calls himself an "unrealistic optimist," and that is a good description since he was the first blind climber ever to reach the top of Mount Everest. Now he does business consulting and charity work, helping people see the world in new ways.

Asked by Fast Company magazine what he looks for in teammates, his response sums up what faith is all about. He said, "I look for people who have an unrealistic optimism about life. I hear people say, 'seeing is believing.' I want people who believe the opposite, 'Believing is seeing.' You've got to believe first in what you're doing and be sure you have a reason to believe it. You can tell who those people are. You say, "Hey, want to climb Everest with a blind guy?" Pretty quickly you'll figure out who's a believer.