The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore, all progress depends on the unreasonable man.
attributed to George Bernard Shaw
Source:
Elkington, John, and Pamela Hartigan. The Power of Unreasonable People: How Social Entrepreneurs Create Markets That Change the World. Boston, MA: Harvard Business School Press, 2008.
(Note: Elkington and Hartigan cite Shaw’s Man and Superman as the location of the Shaw quote.)