There is always room and occasion enough for a true book on any subject; as there is room for more light the brightest day and more rays will not interfere with the first.—A Week on the Concord and Merrimack Rivers
There is no such thing as pure objective observation. Your observation, to be interesting, i.e. to be significant, must be subjective.—Journal, 6 May 1854
These modern ingenious sciences and arts do not affect me as those more venerable arts of hunting and fishing, and even of husbandry in its primitive and simple form; as ancient and honorable trades as the sun and moon and winds pursue, coeval with the faculties of man, and invented when these were invented.—A Week on the Concord and Merrimack Rivers
Those things for which the most money is demanded are never the things which the student most wants. Tuition, for instance, is an important item in the term bill, while for the far more valuable education which he gets by associating with the most cultivated of his contemporaries no charge is made.—Walden
To what end do I lead a simple life at all, pray? That I may teach others to simplify their lives? — and so all our lives be simplified merely, like an algebraic formula? Or not, rather, that I may make use of the ground I have cleared to live more worthily and profitably?—Thoreau to H. G. O. Blake, 26 September 1855
We boast of our system of education, but why stop at schoolmasters and schoolhouses? We are all schoolmasters, and our schoolhouse is the universe. To attend chiefly to the desk or schoolhouse while we neglect the scenery in which it is placed is absurd. If we do not look out we shall find our find schoolhouse standing in a cow-yard at last.—Journal, 15 October 1859
We do not learn by inference and deduction, and the application of mathematics to philosophy, but by  direct intercourse and sympathy.—"Natural History of Massachusetts"
We do not ride on the railroad; it rides upon us. Did you ever think what those sleepers are that underlie the railroad? Each one is a man . . . The rails are laid on them, and they are covered with sand, and the cars run smoothly over them. They are sound sleepers, I assure you. And every few years a new lot is laid down and run over; so that, if some have the pleasure of riding on a rail, others have the misfortune to be ridden upon.—Walden
We have heard of a Society for the Diffusion of Useful Knowledge. It is said that knowledge is power, and the like. Methinks there is equal need of a Society for the Diffusion of Useful Ignorance, what we will call Beautiful Knowledge, a knowledge useful in a higher sense: for what is most of our boasted so-called knowledge but a conceit that we know something, which robs us of the advantage of our actual ignorance? What we call knowledge is often our positive ignorance; ignorance our negative knowledge.—"Walking"
We saw one school-house in our walk, and listened to the sounds which issued from it; but it appeared like a place where the process, not of enlightening, but of obfuscating the mind was going on, and the pupils received only so much light as could penetrate the shadow of the Catholic church.—A Yankee in Canada
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