The Phenomenology of Religious Life presents the text of Heidegger'simportant 1920--21 lectures on religion. The volume consists of the famous lecturecourse Introduction to the Phenomenology of Religion, a course on Augustine andNeoplatonism, and notes for a course on The Philosophical Foundations of MedievalMysticism that was never delivered. Heidegger's engagements with Aristotle, St.Paul, Augustine, and Luther give readers a sense of what phenomenology would come tomean in the mature expression of his thought. Heidegger reveals an impressivedisplay of theological knowledge, protecting Christian life experience from Greekphilosophy and defending Paul against Nietzsche.