Those who can't do, teach. Don't know where I heard/read that....
And those who can't teach, tell / teach others how to teach.
Like, those who don't know have a clue how to raise children, tell others how to raise their children.
Education is mostly inspiring the kids to want to learn, instilling intellectual curiosity. Then it's possible to save them time by teaching them how to think. Really, though, once the fire is lit, no one can stop them. I attended fairly good schools, but they were largely a waste of time.