Book excerpt: DigiCat presents to you this unique collection of fundamental religious works presenting the theology, philosophy and spirituality of Christianity: The Philosophy of Religion: The Confessions of St. Augustine (Saint Augustine) On the Incarnation (Athanasius of Alexandria) On the Soul and the Resurrection (Gregory of Nyssa) On the Holy Spirit (Basil the Great) Pastoral Care (Pope Gregory I) An Exact Exposition of the Orthodox Faith (John of Damascus) Summa Theologica (Saint Thomas Aquinas) The Imitation of Christ (Thomas à Kempis) A Treatise on Christian Liberty (Martin Luther) The Interior Castle (St. Teresa of Ávila) The Practice of the Presence of God (Brother Lawrence) The Age of Reason (Thomas Paine) The Natural History of Religion (David Hume) Dialogues Concerning Natural Religion (David Hume) The Religious Affections (Jonathan Edwards) The Essence of Christianity (Ludwig Feuerbach) Beyond Good and Evil (Friedrich Nietzsche) All of Grace (Charles Spurgeon) Humility: The Journey Toward Holiness (Andrew Murray) Orthodoxy (G. K. Chesterton) The Everlasting Man (G. K. Chesterton) The Sovereignty of God (Arthur Pink) The Kingdom of God Is Within You (Leo Tolstoy) Three Essays on Religion (John Stuart Mill) The Spirituality of a Man: The Conduct of Life (Ralph Waldo Emerson) Lessons in Truth (Emilie Cady) As a Man Thinketh (James Allen) Thoughts are Things (Prentice Mulford) The Game of Life and How to Play It (Florence Scovel Shinn) A New Christ (Wallace D. Wattles) The Swamp Angel (Prentice Mulford)