 Zagzebski builds her argument upon the ideas of moral skepticism and moral efficacy, and, though she does not employ the term, moral order. Morality is efficacious if we can make significant contributions to the production of good in the universe and to the elimination of evil. Moral skepticism is a doubting of our ability to acquire moral knowledge, and a doubting of moral efficacy. Zagzebski argues that it is rational to try to be moral only if it is rational to believe that the probability that the attempt will succeed and will produce a great good is not outweighed by the probability that one will have to sacrifice goods in the course of the attempt. But given what we know of human abilities and history, it is not rational to believe that the attempt to be moral is likely to succeed if there is no moral order. Since it is rational to try to be moral, it is rational to believe that there is moral order in the universe, and Christian doctrine is, in part, an account of there being a moral order in the universe. So, accepting Christian theism is more rational than accepting that there’s no moral order in the universe.