To know him

"Some Jews who went around driving out evil spirits tried to invoke the name of the Lord Jesus over those who were demon-possessed. They would say, "In the name of Jesus, whom Paul preaches, I command you to come out." Seven sons of Sceva, a Jewish chief priest, were doing this. One day the evil spirit answered them, "Jesus I know, and I know about Paul, but who are you?" Then the man who had the evil spirit jumped on them and overpowered them all. He gave them such a beating that they ran out of the house naked and bleeding." (Acts 19.13-16)
This has always struck me as an amusing scene. These sons of Sceva are playing around with something they don't really understand. They are way over their heads. They are trying to invoke the name of Jesus to cast out demons, when they don't even know Jesus. They find out just how dangerous this is.
It's not enough to just know the "historical Jesus" or even to know what the Bible says. We must know Jesus personally. It's not enough to just know the facts of Jesus' life. We must really know him. How do we come to know him? Spend time with his family, the church. And ask Jesus into your heart. The Christian faith is much more than head knowledge. It involves a real relationship with the One we call Lord and Savior.