Barzun's Laws of Learning (laws)
1. The simple but difficult arts of paying attention, copying accurately, following an argument, detecting an ambiguity or a false inference, testing guesses by summoning up contrary instances, organizing one's time and one's thought for study -- all these arts -- cannot be taught in the air but only through the difficulties of a defined subject. They cannot be taught in one course or one year, but must be acquired gradually in dozens of connections.
2. The analogy to athletics must be pressed until all recognize that in the exercise of Intellect those who lack the muscles, coordination, and will power can claim no place at the training table, let alone on the playing field.