Henry David Thoreau built his small cabin on the shore of Walden Pond in 1845. For the next two years he lived there as simply as possible, seeking "the essential facts of life" and learning to eliminate the unnecessary details-material and spiritual-that intrude upon our happiness. He described his experiences in Walden, using vivid, forceful prose that transforms his reflections on nature into richly evocative metaphors to live by. George Eliot's...