Modern medicine has unprecedented power to heal human beings of physical and mental disease, to keep them health, and even to improve the human race. This power can be used to humanize life or to dehumanize and destroy it. It can be used justly to benefit all, or it can be used to benefit the few at the expense of the many. How to use such power is a question of values and, therefore, of individual and group decisions which are not merely technical but ethical. Two reasons have induced us to add to the already extensive literature on medical-ethical and bioethical topics. First, too much of this literature focuses on a few controversial but sometimes minor topics, while neglecting the broader and major issues affecting human health and the health care professions. Second, we want to assist Christian, and especially Catholic, health care professionals and health care facilities faced with the difficult and often puzzling responsibility of giving witness to a long tradition of humanistic health care, while working with other professionals and government agencies committed to diverse value systems. -from Introduction.