Then Jesus demanded, “What is your name?”
And he replied, “My name is Legion, because there are many of us inside this man.”
Mark 5:9 NLT
Little is known about demon possession. It does not appear in the Old Testament. It arises in Jesus’ ministry without explanation of its origin or any of its characteristics, beyond the mention of specific cases. After Jesus, there are a few cases, and the demons disappear completely in the last-written letters of the New Testament.
It would appear that the devil was permitted, during Jesus’ life, to throw everything he had against the Son of God. But even in the most extreme case, that of the uncontrollable man, possessed by many demons, one sees only submission and fear on the part of the evil spirits. They cry out terrified of Jesus and obey immediately as soon as he gives an order.
Satan’s defeat was, and is, total. He throws against us all that he is permitted. (Perhaps today he is limited, or chained, Rev. 20:2-3). But the Christian can, at any given moment, put him on the run by confronting him through submission to God (James 4:7).