To be a teacher does not mean simply to affirm that such a thing is so, or to deliver a lecture, etc.
Soren KierkegaardIf I had a humble spirit in my service who, when I asked for a glass of water, brought me the world's costliest wines blended in a chalice, I should dismiss him, in order to teach him that my pleasure consists, not in what I enjoy, but in having my own way.
Soren Kierkegaard