George Henry Gerberding called Weidner's Studies in the Book his most original contributionto theology. These volumes, covering the entirety of the New Testament and parts of the Old, are based on lectures given by Weidner to students at the Moody Bible Institute in Chicago, IL. In them, he gives outlines of Scriptural books, emphasizing their primary emphasis and theological themes. He gives details about the authorship and dating of each book. This particular volume covers the four Gospels and the Catholic Epistles. Weidner also includes doctrinal chapters on each aspect of the order of salvation, as well as on Scripture and the role of the Holy Spirit. He defends the inerrancy of Holy Scripture, and also gives a thorough defense of traditional authorship and dating for several of the doubted New Testament books.