Continued traveling is far from productive. It begins with wearing away the soles of the shoes, and making the feet sore, and erelong it will wear a man clean up, after making his heart sore into the bargain. I have observed that the afterlife of those who have traveled much is very pathetic.
Henry David ThoreauWhat recommends commerce to me is its enterprise and bravery. It does not clasp its hands and pray to Jupiter.
Henry David ThoreauThe knowledge of an unlearned man is living and luxuriant like a forest, but covered with mosses and lichens and for the most part inaccessible and going to waste; the knowledge of the man of science is like timber collected in yards for public works, which still supports a green sprout here and there, but even this is liable to dry rot.
Henry David ThoreauNothing more strikingly betrays the credulity of mankind than medicine. Quackery is a thing universal, and universally successful. In this case it becomes literally true that no imposition is too great for the credulity of men.
Henry David Thoreau