Peter Kreeft, Ph.D., Professor of Philosophy at Boston College, is one of the most respected and prolific Christian authors of our time. His books cover a vast array of topics in spirituality, theology, and philosophy. They include Doors in the Walls of the World, The Greatest Philosopher Who Ever Lived, Wisdom from the Psalms, How to Destroy Western Civilization, How to Be Holy, Because God Is Real, You Can Understand the Bible, and Summa of the Summa.