Courage is like a muscle. The more we exercise it, the stronger it gets. I sometimes worry that our collective courage is growing weaker from disuse. We don't demand it from our leaders, and our leaders don't demand it from us. The courage deficit is both our problem and our fault. As a result, too many leaders in the public and private sectors lack the courage necessary to honor their obligations to others and to uphold the essential values of leadership.

—U.S. Senator John McCain