Drawing from his own pastoral experience as a priest and bishop before he became Pope John Paul II, Karol Wojtyla has produced a remarkably eloquent and resourceful defense of Catholic tradition in the sphere of family life and sexual morality. He writes in the conviction that science--biology, psychology, sociology--can provide valuable information on particular aspects of relations between the sexes, but that a full understanding can be obtained only by study of the human person as a whole. Central to his argument is the contrast between the personalistic and the utilitarian views of...