It's pretty tragic that, of the twelve men who were sent by Moses to inspect the Promised Land, only two returned with a favorable report.  The land had been promised by God, but these spies sent to inspect the land didn't have faith that God could overcome the giants of the land.  Sure, it was flowing with milk and honey as promised, but there was notice from God that He would drive out the people living there… that was supposed to be the faith side of it all.  Perseverance seems to be a necessary quality of leadership.  God obviously wanted the Israelites to move into the land, and His plan was to get rid of the obstacles when they arose.  Too many times we fall back when obstacles come and abandon the vision that God gives us.  Leaders have to be careful not to presume they know what God's vision is and lead people down a wrong path, and they also have to be careful not to abandon God's vision and lead His people to destruction because of bumps in the road.