Do people know about God just by being human beings? Or do they need special divine assistance, through the Bible and the church? Natural theology was long accepted as a basic ingredient in all theology, but in the twentieth century it was rejected by important theologians, especially Karl Barth. His views denied all natural theology and placed greater emphasis on the Bible. But what if the Bible itself uses, depends on, and supports natural theology? Professor Barr here pursues these questions within the Bible itself and within the history of ideas, earlier and more recent; and he looks at their implications for religion and theology in the future.