Download this free eBook, The Mission and Expansion of Christianity in the First Centuries by Adolf Harnack.
From the eBook: “No monograph has yet been devoted to the mission and spread of the Christian religion during the first three centuries of our era. For the earliest period of church history, we have sketches of the historical development of dogma and of the relation of the church to the state—the latter including Neumann’s excellent volume. But the missionary history has always been neglected, possibly because writers have been discouraged by the difficulty of bringing the material to the surface and getting it arranged, or by the still more formidable difficulties of collecting and sifting the geographical data and statistics. The following pages are a first attempt, and for it I bespeak a kindly judgment. My successors, of whom there will be no lack, will be able to improve upon it.”
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