"Perceptive and valuable personal explorations of time alone include A Book of Silence by Sara Maitland, Party of One by Anneli Rufus, Migrations to Solitude by Sue Halpern, Journal of a Solitude by May Sarton, The Point of Vanishing by Howard Axelrod, Solitude by Robert Kull, Pilgrim at Tinker Creek by Annie Dillard, The Diving Bell and the Butterfly by Jean-Dominique Bauby, A Field Guide to Getting Lost by Rebecca Solnit, The Story of My Heart by Richard Jefferies, Thoughts in Solitude by Thomas Merton, and the incomparable Walden by Henry David Thoreau. Adventure tales offering superb insight into solitude, both its horror and its beauty, include The Long Way by Bernard Moitessier, The Strange Last Voyage of Donald Crowhurst by Nicholas Tomalin and Ron Hall, A Voyage for Madmen by Peter Nichols, Into the Wild by Jon Krakauer, and Alone by Richard E. Byrd. Science-focused books that provided me with further understanding of how solitude affects people include Social by Matthew D. Lieberman, Loneliness by John T. Cacioppo and William Patrick, Quiet by Susan Cain, Neurotribes by Steve Silberman, and An Anthropologist on Mars by Oliver Sacks. Also offering astute ideas about aloneness are Cave in the Snow by Vicki Mackenzie, The Life of Saint Anthony by Saint Athanasius, Letters to a Young Poet by Rainer Maria Rilke, the essays of Ralph Waldo Emerson (especially "Nature" and "Self-Reliance") and Friedrich Nietzsche (especially "Man Alone with Himself"), the verse of William Wordsworth, and the poems of Han-shan, Shih-te, and Wang Fan-chih. It was essential for me to read two of Knight's favorite books: Notes from the Underground by Fyodor Dostoyevsky and Very Special People by Frederick Drimmer. This book's epigraph, attributed to Socrates, comes from the C. D. Yonge translation of Diogenes Laertius's third-century A.D. work The Lives and Opinions of Eminent Philosophers. The Hermitary website, which offers hundreds of articles on every aspect of hermit life, is an invaluable resource--I spent weeks immersed in the site, though I did not qualify to become a member of the hermit-only chat groups. My longtime researcher, Jeanne Harper, dug up hundreds of reports on hermits and loners throughout history. I was fascinated by the stories of Japanese soldiers who continued fighting World War II for decades on remote Pacific islands, though none seemed to be completely alone for more than a few years at a time. Still, Hiroo Onoda's No Surrender is a fascinating account."