-31). Besides, the New Testament has to be read in the light of the Old. Early Christian catechesis made constant use of the Old Testament (1 Cor. 5:6-8; 10:1-11). As an old saying put it, the New Testament lies hidden in the Old and the Old Testament is unveiled in the New (St. Augustine, Quaestiones in Heptateuchum 2:73)." An overview of the four Gospels is given. We look at who wrote the Gospels, who their audiences most probably were, as well as the major themes they contain. We then move on to discuss Acts of the Apostles, St. Paul's 13 Epistles, the Epistle to the Hebrews, the 7 Catholic Epistles, and the Book of Revelation.