Modern theologians rely on the arguments by David Hume, an eighteenth-century Scottish philosopher, who is known today for his skepticism and naturalism. Before making any claims, Hume explains the principle of evidence: the only way that we can assess the credibility of two claims is by weighing evidence. According to Hume, because evidence for miracles consists of a limited set of instances, every instance of normalcy in the real world adds up to evidence that far outweighs the evidence for miracles.