But what exactly do we mean by the word “believe”? Is it enough to feel something deeply, or is action necessary? If so, what sort of action must be taken to bolster the object of our belief? Many of the greatest atrocities in human history have been committed by humans who firmly believed that they were doing the right thing. Is the worth of our beliefs judged by the glories (or horrors) we may experience because we adhere to something—or is there another way to measure belief? And who gets to judge whether the results of our beliefs are right or wrong?