1. Demonology
Mark 3:22-30

2. 22  And the scribes who came down from Jerusalem said, "He has Beelzebub," and, "By the ruler of the demons He casts out demons." 
23  So He called them to Himself and said to them in parables: "How can Satan cast out Satan? 
24  If a kingdom is divided against itself, that kingdom cannot stand. 
25  And if a house is divided against itself, that house cannot stand. 
26  And if Satan has risen up against himself, and is divided, he cannot stand, but has an end. 
27  No one can enter a strong man's house and plunder his goods, unless he first binds the strong man. And then he will plunder his house. 
28  "Assuredly, I say to you, all sins will be forgiven the sons of men, and whatever blasphemies they may utter; 
29  but he who blasphemes against the Holy Spirit never has forgiveness, but is subject to eternal condemnation"— 
30  because they said, "He has an unclean spirit." 
Mark 3:22-30

3. Background Truths-Demonology
Various terms used to describe demons (NKJV)
Demon/demons – 81 times
Evil spirit/spirits – 6 times
Unclean spirit/spirits – 22 times
Terms used 109 times in the Bible
Not an O.T. study
Demon in OT referred to idols—Lev. 17:7; Deut. 32:17; 2 Chron. 11:15; Psa. 106:37 (cf. Saul—1 Sam. 16; that spirit was from God
Evil spirit used prophetically in Zech. 13:2
Demon/Demons are mentioned, but demon possession not found after Acts in NT

4. Background Truths-Demonology
Not all disease caused by demons
Matt. 4:24; 8:16; 10:1, 8
Mark 1:32, 34; 6:13
Acts 5:16
Some diseases manifest in sickness
Mute, unable to speak –Matt. 9:32
Blindness—Matt. 12:22
Deafness—Mark 9:25
Epilepsy—Matt. 17:15
Super-human strength—Luke 8:27
So different from modern view of possession

5. Key Passages on Possession
The incident with Legion and the swine—Luke 8
Demons knew who Jesus was
Demons knew their time was limited
Demons knew their destiny—”Please, not the abyss”
Amazingly demons cast in swine and drown
Jesus’ power was so different from “exorcists”
The Beelzebub and blasphemy passage—Mk. 3; Mt. 12
So vital that this charge proven wrong
Jesus explains—Must bind strong man, plunder his house
He came to destroy (ruin) Satan—Heb. 2:14
Casting out demons manifested His greatness
He plundered Satan in His resurrection
Possession & prophecy both to end--Zec. 13:2

6. God’s Plan of Salvation
Believe John 8:24
Repent Acts 17:30
Confess Faith Rom. 10:9
Be Baptized Into Him Acts 2:38
Added to His church, His body, His kingdom
Be Faithful Rev. 2:10