In 1930, Pius XI published a letter to the world to answer a fundamental question - "What is Marriage?" As even Christians began to accept divorce and remarriage, contraception, and abortion, the Pope eloquently and beautifully defended the ancient understanding of marriage as grounded in Scripture and natural law. This guided reading of the encyclical Casti Connubii will help you, your friends, and your parish understand what the Church teaches and has always taught about this fundamental institution, God's first covenant with man. In a readable, engaging style, Leila Marie Lawler explains the work to you, giving you the background you need and the tools for applying the Church's wisdom to today's world.