An extended version of the James W. Richard Lectures delivered by the author at the University of Virginia in the fall of 1951. The first six chapters develop the seemingly irreconcilable contrast between Biblical personalism and the categories of ontology. The last two chapters indicate briefly how they supplement each other. Theologians accuse Tillich of slighting Biblical concepts; philosophers taunt him for too readily despairing of ontology. In this book he tries to do justice to both.--D. R.