The school has not taught how to learn; now it wants to climb that Mt. Everest of intellect, critical thought. Critical thinking can only be learned by the discussion of an idea which is part of a subject, under the guidance of an able thinker. Thinking is like piano-playing; it is shown, not taught.

Begin Here: The Forgotten Conditions of Teaching and Learning (p. 46), The University of Chicago Press. 1991