Most of the time, if you’re honest with yourself, you know that your vision of the future is just your best estimate at the moment: The practice of leadership requires the capacity to keep asking basic questions of yourself and of the people in your organizations and community. The assumptions that hold you also constrain you from seeing any other points of view.
(Ronald Heifetz and Marty Linsky, Leadership on the Line: Staying Alive through the Dangers of Leading)