Peter Kreeft, Ph.D., Professor of Philosophy at Boston College, is one of the most widely read Christian authors of our time. His many bestselling books cover a vast array of topics in spirituality, theology, and philosophy. They include Practical Theology, Back to Virtue, Because God Is Real, You Can Understand the Bible, Angels and Demons, Heaven: The Heart's Deepest Longing, and A Summa of the Summa.