 Someone might suggest that the patient's knowledge that his “faith helps create the fact” itself counts as a kind of evidence in its favor. If this is right, then the case would not be in tension with Clifford's Principle after all. But other cases can be used to make the same point: Pascal famously argues that it is required by prudential rationality that we believe in God, even though we lack sufficient evidence for that belief, and even though such belief would play no role in “creating” the fact that it describes (Pascal 1670).