"Yes, Thoreau showed me things, and though it didn't aid me in the Harvard curriculum, it helped me through life.
"Truly, Nature absorbed his attention, but I don't think he cared much for what is called the beauties of nature; it was her way of working, her mystery, her economy in extravagance; he delighted to trace her footsteps toward their source .... He liked to feel that the pursuit was endless, with mystery at both ends of it . . ."