It is not uncommon, for example, to hear “teachers” make statements such as, “Oh, I taught them that, but they didn’t learn it.” There is no utterance made in the Teachers’ Room more extraordinary than this. From our point of view, it is on the same level as a salesman’s remarking, “I sold it to him, but he didn’t buy it”—which is to say, it makes no sense. It seems to mean that “teaching” is what a “teacher” does, which, in turn, may or may not bear any relationship to what those being “taught” do.
— Teaching As a Subversive Activity by Neil Postman