Paul Tillich

Paul Tillich was one of the most influential theologians of the 20th century, synthesizing Christian theology with existentialist philosophy. He developed the method of correlation—answering existential human questions with theological responses—and his concept of God as Ground of Being rather than a personal supernatural being fundamentally reshaped modern theology.

Developed the concept of God as Ground of Being or Being-Itself; created the method of correlation between existential questions and theological answers; formulated ultimate concern as defining religion; the three-volume Systematic Theology as a major architectonic achievement of 20th-century theology.