Faith as ultimate concern is an act of the total personality. It happens in the center of the personal life and includes all its elements. Faith is the most centered act of the human mind. It is not a movement of a special section or a special function of man's total being. They all are united in the act of faith.
Paul TillichIn this respect fundamentalism has demonic traits. It destroys the humble honesty of the search for truth, it splits the conscience of its thoughtful adherents, and it makes them fanatical because they are forced to suppress elements of truth of which they are dimly aware
Paul TillichAnxiety may consist of the loss of psychological or spiritual meaning which is identified with one's existence as a self, i.e., the threat of meaninglessness.
Paul Tillich