In this passage Jesus begins his ministry in earnest, hitting the ground running. The first miracle Mark records is Jesus casting out an unclean spirit. Some think that this is Mark’s way of showing that Jesus was joining in the struggle against the powers of evil and destruction, and winning a victory over it. This could be why Jesus was so popular with people right from he beginning. Finally there was someone who had authority over the evil that haunted their world and took over their lives. They were no longer held captive to the destructive forces that dominated. Jesus was giving them back their lives.