We didn't know what the problems were when they were in the dark. Our life was a messy garage with the light out. Now, with the light on, we can see the problems plainly. Good teaching is not just about solutions, it is about creating problems. Until the problems are in the light, there can be no solutions.
Good teachers leave a little creative tension in the air the whole hour.
Mediocre teachers prefer to avoid tension at all costs. They like everything settled, everything neat, everything as it should be. They don't like any questions, any uncertainty. All is at peace. All is quiet.