 Man Is Not Alone by Abraham Joshua Heschel |  God in Search of Man by Abraham Joshua Heschel |  Thus Spake Zarathustra by Friedrich Nietzsche |  Varieties of Religious Experience by William James |  Either/Or: A Fragment of Life by Soren Kierkegaard |  I and Thou by Martin Buber |  The Horrors and Absurdities of Religion by Arthur Schopenhauer |  Dialogues Concerning Natural Religion by David Hume |  The Inner Life by Thomas a Kempis |  Gravity and Grace by Simone Weil |  Critique of Religion and Philosophy by Walter Arnold Kaufmann |  The Perennial Philosophy by Aldous Huxley |  From Religion to Philosophy by Francis Macdonald Cornford |  The Anti-Christ by Friedrich Nietzsche |  The Sickness Unto Death by Soren Kierkegaard |  Fear and Trembling by Soren Kierkegaard |  The Antichrist by Friedrich Nietzsche |  Summa Theologica by Thomas Aquinas |  Mysticism and Logic by Bertrand Russell |  The Imitation of Christ by Thomas a Kempis |