The Missionary Origins of Modern Ecumenism

The impact of the contemporary ecumenical movement on the life of the Church in the 20th century has been immense. Orthodox involvement has steadily increased over the years and is now generally accepted as a given. Still, many questions remain unanswered and unasked. How did the modern ecumenical movement begin? What were the causes, motivations, and reasons for its development? Why and how did the Orthodox first become involved? Did the movement for Christian unity begin with the 1920 encyclic