Thoreau on education

I am reading Walden for the first time, and this is almost is impossible to do without my commonplace book beside me. Which it is not. This is what I would be writing into it, if it were:

The student who secures his coveted leisure and retirement by systematically shirking any labor necessary to man obtains but an ignoble and unprofitable leisure, defrauding himself of the experience which alone can make leisure fruitful. "But," says one, "you do not mean that the students should go to work with their hands instead of their heads?" I do not mean that exactly, but I mean something which he might think a good deal like that; I mean that they should not play life, or study it merely, while the community supports them at this expensive game, but earnestly live it from beginning to end. How could youths better learn to live than by at once trying the experiment of living? Methinks this would exercise their minds as much as mathematics. If I wished a boy to know something about the arts and sciences, for instance, I would not pursue the common course, which is merely to send him into the neighborhood of some professor, where anything is professed and practised but the art of life; — to survey the world through a telescope or a microscope, and never with his natural eye; to study chemistry, and not learn how his bread is made, or mechanics, and not learn how it is earned; to discover new satellites to Neptune, and not detect the motes in his eyes, or to what vagabond he is a satellite himself; or to be devoured by the monsters that swarm all around him, while contemplating the monsters in a drop of vinegar. Which would have advanced the most at the end of a month — the boy who had made his own jackknife from the ore which he had dug and smelted, reading as much as would be necessary for this — or the boy who had attended the lectures on metallurgy at the Institute in the meanwhile, and had received a Rodgers' penknife from his father? Which would be most likely to cut his fingers?... To my astonishment I was informed on leaving college that I had studied navigation! — why, if I had taken one turn down the harbor I should have known more about it.