Through more than forty years of his career, Paul Tillich painstakingly developed a vision of an ontological conflict between space and time. In developing this vision, Tillich proceeds from an existential and phenomenological perspective. An entire doctrine of reality is presupposed and time is conceived of as temporality and is ontologically identified with the primordial ‘depth’ or inner infinity of all being and reality. Such time is in some sense subjective, intuitively known, and immediately given.