Vision is a picture of the future that produces passion.
You're a leader. It's your job to keep your passion hot. Do whatever you have to do, read whatever you have to read, go wherever you have to go to stay fired up. And don't apologize to anybody.
Effective leaders do not fear passion. They welcome it. But from time to time passionate discussions digress into personal attacks, and real people get really hurt. In my view, leaders must head that off before it happens.