Authority

When you make someone an authority on a topic you stop questioning and when you stop questioning you stop learning. You blindly accept whatever he or she says because in the past they have been right. Just because they have been right in the past does not mean they are right now. The second problem in making someone an authority over a topic you stop listening others. You narrow your listening to one person and that too without critical thought. You passively accept input without much thought. You might as well be sitting in front of a TV.

Is there anything more destructive to learning than making your teacher an authority on that topic? The student is destroyed and in that process so is the teacher and teaching is lost.