One of the most common mistakes is to make the mission statement a kind of hero sandwich of good intentions. Instead, organize yourselves to see the opportunities, the needs. Where can we, with the limited resources we have - and I don't mean just people and money, but also competence - really make a difference, set a new standard?
The next thing to look at is what you really believe in. I have never seen anything being done well unless people are committed. What attracts people to any organization, including the church, are high standards, because high standards create self-respect and pride.
Peter Drucker, Managing the Nonprofit Organization: Principles and Practices