When Jesus got out of the boat, a man came to him from the caves where dead people are buried. This man had an evil spirit {from the devil} living inside of him.
Many times people had used chains to tie the man's hands and feet. But the man broke the chains on his hands and feet. No person was strong enough to control him.
Jesus said to the man, "You evil spirit, come out of that man." So the man shouted with a loud voice, "What do you want with me, Jesus, Son of the Most High God? I beg you to promise to God that you will not punish me!"