As a free and rational creature, man can choose good or evil. We have thus also considered what is good or evil, so that we can help to determine what is proper for man to choose. We have discussed many of the particulars of the law, of virtue and vice, of moral decisions, of grace and of moral issues that we face in modern day.
Perhaps an obvious point that we have not fully elaborated yet is the why of moral living. Yes, because we should choose good over evil. Yes, because God has revealed to us what is good and even written it upon our hearts. Yet, does that really answer the question?