Rebuilding the Temple

What happens when an idea, movement, or organization get's off of its original vision and purpose?  How does it find its way back?

This is the question the prophets ask in the Old Testament as Israel goes into exile.  Where did we go wrong?  And as Ezekiel dreams of a new temple and Ezra rebuilds the temple, they wonder how to do it differently now.  What can our church today learn from this time in history?