This is a great interview with Chris Rosebrough about "vision-casting" in the church. PLEASE listen!! It is fascinating, revealing and quite shocking:

Casting a vision or commandeering control?

Acts 20:29-31 says: "Savage wolves will come in among you and will not spare the flock. Even from your own number men will arise and distort the truth in order to draw disciples after them. So be on your guard!"