The power of a bold idea uttered publicly in defiance of dominant opinion cannot be easily measured. Those special people who speak out in such a way as to shake up not only the self-assurance of their enemies, but the complacency of their friends, are precious catalysts for change.
Howard Zinn, You Can't Be Neutral on a Moving Train: A Personal History of Our Times
catalyst, change, defiance, history, opposition, self-assurance