Moral relativism leaves us in the frustrating position of not being able to say that there is a moral difference between Adolph Hitler and Mother Teresa. The only way to do so would be to appeal to an external standard of morality. Yet, this is precisely what moral relativism denies. But surely such a conclusion is absurd. Mother Teresa lived to save lives; Hitler lived to destroy them. There are many reasons to reject moral relativism, but this is one of the most persuasive.