Jesus demonstrates His power over the demonic realm. This passage shows there is no true battle going on between Jesus and the forces of darkness. Rather, they all bow to His Word. It's a wonderful story in which Jesus frees a gentile man from the oppressive evil powers who have been torturing him for a long time. The account shows just how far Jesus is willing to go to save the sinner. It also shows there is no one who is too unclean for his cleansing work. The application of the passage is to observe what this man becomes -- a missionary to his own people. He is saved by Jesus, but then left in his own city to declare the great things that Jesus has done for him.