The unique masterpiece introduces its readers to the theological literature of the early church and provides tools for understanding ecclesiastical texts. At the same time, the work is an excellent introduction to the theology and ecclesiastical practice of the first Christian centuries.

The book is divided into four main chapters.

First, the world of early Christians: in what environment was Christianity born, what in it appealed to the people of the era, and what was the relationship between Christians and their environment. The second chapter sheds light on the development of early Christian theology and examines how the proclamation of the New Faith developed into a theological reflection and what authorities the Church relied on. The third chapter focuses on two key features of Christianity, the doctrine of the Trinity and Christology, the formation of which is monitored in the light of early sources. The fourth chapter examines the relationship between man and God in the teaching and life of the early Church.

The work is a valuable handbook for religious teachers and necessary for anyone who is interested in the history of the Church or wants to understand the theology of our time and the theological emphases of the various churches. The book was written by prof. Gunnar af Hällström (University of Joensuu), TT Anni Maria Laato (Åbo Akademi) and Bishop, dos. (University of Helsinki) Juha Pihkala. In their research, they have become acquainted with the dogmatics and history of the early church. Everyone has also been involved in ecumenical work.