Reviews changes in how Catholics understand morality and sin over the last few decades. Catholic teaching in the pre-Vatican II Church stressed obedience, law and sin. The Second Vatican Council brought a fuller, more positive view of the Christian life. The Council documents emphasized Scripture, the individual's relationship to Jesus and the community. Today Catholics face the impact of science and technology on moral decisionmaking (especially in the area of medical ethics) and the challenge of materialism and consumerism in everyday decisions. A balanced and readable presentation.