But if you examine historically how this has gone, usually, given enough time, the leaven of unbelief has a way of getting at the central things. If it starts to eat away at it, you've got deep trouble. In many ways, heresies, though they begin way out on the edges, have a way of munching their way to the center. Every professor has to think about this, because he might be teaching something that is not in accord with truth, either knowingly or unknowingly. And for certain, his students are going to take it further.
Students have a way of doing that.
That is why there is a double standard of judgment for teachers. In some ways, I am responsible for what my students teach. That is the way it has gone throughout history.