The enthusiasm to evangelize which marked the early Christians is one of the most remarkable things in the history of religions. Here were men and women of every rank and station in life, of every country in the known world, so convinced that they had discovered the riddle of the universe, so sure of the one true God whom they had come to know, that nothing must stand in the way of their passing on this good news to others. As we have seen, they did it by preaching and personal conversation, by formal discourse and informal testimony, by arguing in the synagogue and by chattering in the laundry. They might be slighted, laughed at, disenfranchised, robbed of their possessions, their homes, even their families, but this would not stop them. They might be reported to the authorities as dangerous atheists, and required to sacrifice to the imperial gods; but they refused to comply. In Christianity they had found something utterly new, authentic and satisfying. They were not prepared to deny Christ even in order to preserve their own lives; and in the manner of their dying they make converts to their faith.
—Michael Green, Evangelism in the Early Church, 236; quoted in Perspectives of Evangelism: Encouraging Effective Evangelism, 45-46