This asserts a knowledge of God from the creation outside the bounds of revealed theology in the Bible. Psalm 19; Romans 1:19-21; Acts 14:15-17 and 17:24-29 imply a natural revelation of God available from nature and creation. Usually the question is not whether there exists some form of natural revelation, but rather what theology, if any, can be developed from it. Augustine* asserted that all knowledge of God was revealed. Anselm* developed the ontological argument for God's existence which was essentially a rationalistic argument divorced from revelation. [[Thomas Aquinas]]* modified Augustine and others considerably with his Scholastic view of reason and revelation, borrowing heavily from Aristotle.* Between Tertullian* and Aquinas a change had developed, with reason displacing revelation as the starting point of theological discovery.