Rudolf Bultmann's Theology of the New Testament (Volume Two) focuses on the theology of the Gospel of John and the Johannine epistles, as well as theological developments beyond Paul, including the Catholic epistles and Ignatius. Bultmann emphasizes demythologizing, viewing John's Gospel not as literal history but as an existential witness to Christ's revelation. The volume also traces how early church thought shifted from intense apocalyptic eschatology to a more structured and institutionalized salvation history (Heilsgeschichte). It emphasizes a rigorous historical-critical approach combined with existential interpretation to make the New Testament's message relevant to modern people.