Christians affirm that Scripture alone reveals truths about God which cannot be known by mere reason, such as the Trinity or the Gospel itself. But how do we account for Scripture's apparent talk of a knowledge of God possible solely from creation? Or for our own sense of the divine in nature? Or for the startling insights of ancient philosophers about the nature of God? The answer: natural theology. Often misrepresented as a fruitless human attempt to comprehend God, natural theology has in fact been a significant part of Christian theology throughout history. It has shaped the Christian doctrine of God and provided a starting point for evangelizing non-Christians. In an age when theologians and missionaries alike are in need of stronger doctrinal foundations, it is a doctrine as vital as ever. In this guide, David Haines first outlines the biblical basis for natural theology, suggesting that, if Scripture is correct, certain truths about God should be well attested by non-Christians. A thorough historical survey demonstrates that this is indeed the case, and that the Church has long made use of that which is revealed to reason in order to serve Christ, who is revealed to faith.