Paul Tillich, existentialism and Paul Tillich, the Realm of Existentialism at DividingLine.com

Paul Tillich, a German-born U.S. theologian and philosopher whose discussions of God and faith illuminated and bound together the realms of traditional Christianity and modern culture. Some of Tillich's books, notably The Courage to Be (1952) and Dynamics of Faith (1957), reached a large public audience not usually concerned with religious matters. The three-volume Systematic Theology (1951–63) was the culmination of his rigorous examination of faith.

Paul Tillich was a central figure in the intellectual life of his time both in Germany and the United States. It is generally held that the 20th century has been marked by a widespread breakdown of traditional Christian convictions about God, morality, and the meaning of human existence in general. In assessing Tillich's role in relation to this development, some critics have regarded him as the last major spokesman for a vanishing Christian culture, a systematic thinker who sought to demonstrate the reasonableness of the Christian faith to modern skeptics. Others have viewed him as a forerunner of the contemporary cultural revolution, whose discussions of the meaning of God and faith served themselves to undermine traditional beliefs. Tillich himself believed he was a “boundary man,” standing between the old and the new, between a heritage imbued with a sense of the sacred and the secular orientation of the new age. He asserted that his vocation was to mediate between the concerns voiced by faith and the imperatives of a questioning reason, thus helping to heal the ruptures threatening to destroy Western civilization. Tillich believed that from the beginning life had prepared him for such a role, and his long career as a theologian, educator, and writer was devoted to this task with single-minded energy.