“A Christianity which had ceased to be aggressive would speedily have ceased to exist. Christ came not to send peace on earth but a sword; against the restless and resistless force of the new religion the gates of hell should not prevail. But polytheism could not be dethroned without a struggle; nor mankind regenerated without a baptism of blood. Persecution, in fact, is the other side of aggression, the inevitable outcome of a truly missionary spirit; the two are linked together as action and reaction.” Herbert Workman, Persecution in the Early Church, p. 39.
Here is a note from Pastor Tim Bayly (who wrote the forward). His recommendation inspired my purchase.