This best-selling resource on the scriptural and theological underpinnings to Catholic moral and spiritual life has now been extensively revised to reflect the teachings of the Catechism of the Catholic Church as well as new Church documents such as Veritatis Splendor and Evangelium Vitae which were released since the initial publication. In this book, the reader learns what it is to live the Christian life by not merely expounding on Christian teaching but by showing where the teachings come from and why they are essential to the Christian life.