This book attempts to reconcile the analytic philosophy of Ludwig Wittgenstein with those issues that consumed his personal life and which lay outside the confines of analytic philosophy: his religious disposition, his ascetic lifestyle, and his concern with the mystical. Sontag reveals the influence of the mystical on Wittgenstein's life and philosophy, his respect for Augustine, Kierkegaard, and William James, and the profound effect of Tolstoy's religious writings on the development of his philosophy.