sheer presence of bias is not reason enough to discredit reports. We would have to throw out all of history, indeed all news reports and personal stories from friends, if that were the case. Second, these sources are written by people of various backgrounds, and generally speaking, they did not start their lives as Christians. Though originally non-Christians, they found the Christian message convincing enough to convert, often at great cost. Therefore, if anything, their testimony may be granted an extra measure of credibility.9
