The latter work offered an encyclopedic understanding of the development of Christian doctrine, from the New Testament period into the 17th century, according to modern historical-critical methods. In it, Seeberg offers a more traditional assessment of the essentials of Christian teachings, in contrast to his colleague Adolph von Harnack, the elder historian of dogma at Berlin. Seeberg also emphasized the social nature of the Church, a teaching which became important to his students.[3]