Thomas Hobbes He who can, does. He who cannot teaches. Philosophy is a game with objectives and no rules. Mathematics is a game with rules and no objectives.
Time is the best teacher.
Unfortunately, it kills all its pupils. An intellectual is a man who takes more words than necessary to tell more than he knows. If the aborigine drafted an IQ test, all of Western civilization would presumably flunk it. It is not the answer that enlightens, but the question. You teach best what you most need to learn.