At a time when the nations of Europe were engaged in fierce conflict, one of the twentieth century's most influential pastors taught his congregation about the threat of persecution and suffering and how it should be viewed. When the war ended in 1947, D. Martyn Lloyd-Jones sought to refocus the people on the basics of the faith with a series of messages entitled, "What is a Christian?" based on Romans 8. Since the rise of terrorism in the twenty-first century, these previously unpublished sermons have become startlingly relevant to what is happening in our own times. Readers will find hope, encouragement, and a balanced view of how Christians should live during an "age of terror."