Book excerpt: "The Missionary Dynamism of the Church of the East It would be an attractive undertaking for the historian to be able to follow in the footsteps of those heralds of the Gospel, who went forth from Antioch with firmness and tenacity in those early days making their way to the East . . . building new centers of Christian irradiation, creating communities and spreading the doctrine of Jesus everywhere. The interest would certainly grow if we were familiar with the challenges faced by these first evangelizers on their way to the Far East. Gaining that knowledge, however, is no easy task. Christ's teaching had to cover immense distances on its road from Antioch towards the East. . . . The details of this diffusion, however, remain obscure. There are no Acts of the Apostles, no Letters of Saint Paul, no contemporary or near-contemporary documents that might tell us how and when Christianity from the region of the Euphrates and the Tigris crossed over the mountainous regions of the Orient, how through Media and Parthia it went south to Herat and Segestan, and how it penetrated eastward, crossing the Margiana (Merv), into the region of the Oxus and the Jaxartes, and finally how it entered today's Russian province of Semireč'e, then Turfan, and then further south into the heart of China"--