In this volume, the third and last of his Systematic Theology, Paul Tillich sets forth his ideas of the meaning of human life, the doctrine of the Spirit and the church, the trinitarian symbols, the relation of history to the Kingdom of God, and the eschatological symbols. He handles this subject matter with powerful conceptual ability and intellectual grace.

The problem of life is ambiguity. Every process of life has its contrast within itself, thus driving man to the quest for unambiguous life or life under the impact of the Spritual Presence. The Spritual Presence conquers the negativities of religion, culture, and morality, and the symbols anticipating Eternal Life present the answer to the problem of life.