The document discusses the principle of power evangelism, which is the idea that Christians should preach the gospel with displays of God's power by casting out demons, healing the sick, and performing other miracles. It provides examples from the Bible of Jesus and the apostles modeling this approach. It maintains that while signs and wonders accompanied their preaching, it was the message of Jesus' death and resurrection that actually saved people. The document concludes by outlining steps for Christians to exercise power evangelism, such as having a godly lifestyle, total dependence on God rather than their own resources, and discerning people's real needs and the sources of their problems.