Koinonia in the New Testament. A dynamic expression of christian life

New Testament authors expressed the essence of Christianity in one word. It is the Greek word koin?nia usually translated as "fellowship". Interesting studies on the term koin?nia have appeared from the 1930's onward. But the author observes that almost all the works on koin?nia he has encountered are concerned with the discussion of the philological aspects of the word koin?nia. Using these works as a basis the author tries in this study to find the theological implications of the NT koin?nia. The depth and beauty of the NT koin?nia could serve as guidelines to a new Ecclesiology, resulting from an enriched Christology.