Grundriss der Neutestamentlichen Theologie

This book is a systematic overview of New Testament theology. The work explores the foundational doctrines of Christianity based on the texts of the New Testament. Zahn examines the theological perspectives of various authors—such as Paul, the evangelists, and the apostle John—and aims to show how the New Testament presents a unified and coherent body of doctrine. His approach is conservative, emphasizing the historical reliability and apostolic origins of the New Testament writings.