Mat 8:28 And when he was come to the other side into the country of the Gergesenes, there met him two possessed with devils, coming out of the tombs, exceeding fierce, so that no man might pass by that way.
Mat 8:29 And, behold, they cried out, saying, What have we to do with thee, Jesus, thou Son of God? art thou come hither to torment us before the time?
Mat 8:30 And there was a good way off from them an herd of many swine feeding.
Mat 8:31 So the devils besought him, saying, If thou cast us out, suffer us to go away into the herd of swine.
Mat 8:32 And he said unto them, Go. And when they were come out, they went into the herd of swine: and, behold, the whole herd of swine ran violently down a steep place into the sea, and perished in the waters.
Mat 8:33 And they that kept them fled, and went their ways into the city, and told every thing, and what was befallen to the possessed of the devils.
Mat 8:34 And, behold, the whole city came out to meet Jesus: and when they saw him, they besought him that he would depart out of their coasts.
Demons will get on their knees in front of Jesus, but only to plead before Him as we can read in the above verses that they ran towards Jesus pleading to be put into the swine.
Mark 5:1-20 is the definitive passage on demon possession and its effects in the Bible. Some of the details about demons the Bible reveals in this passage are:
1. Devils want to be near dead human bodies or tombs (vs. 2, 3, 5).
2. They can cause unusual strength (vs. 3-4).
3. They can make a person unreasonable or immune to sensible persuasion (vs. 4).
4. They cause excessive crying (vs. 5).
5. They cause sadistic and masochistic behavior (vs. 5).
6. They have an affinity for heights (vs. 5).
7. They recognize Christ as "the Son of God" and appeal to Him (vs. 6-7).
8. They know they deserve torment and dread it (vs. 6-7).
9. They have names (vs. 9).
10. More than one can possess the same body (vs. 9).
11. They desire to stay in the same geographical region or "country" (vs. 10).
12. They would rather indwell an animal body than none at all (vs. 12).
13. They can cause animals to kill themselves (vs. 13).
14. They desire to be in a body when it dies (vs. 13).
15. They have a desire for water (vs. 13).
Mark 9:17-29 gives us even more details about devils:
16. They can cause dumbness and deafness (vs. 17, 25).
17. They cause rabid animal like behavior (vs. 18).
18. They can indwell from childhood (vs. 21).
19. They cause suicidal behavior (vs. 22).
20. They resist leaving a body and violently "rent" it while leaving (vs. 26).
21. There are different kinds of devils. Some have more power than others (vs. 29).
22. Some can only be removed by prayer and fasting of believer (vs. 29).
Ephesians 6:12 states Satan has a hierarchy of "devils" in his kingdom, "For we wrestle not against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high places." Thus some devils have more power and authority than others.
In Daniel 10:13 (as well as Mark 9:29) there is an example of this. "The prince of the kingdom of Persia" withstood the angel sent to explain Daniel's vision to him for 21 days. He could only break free when the angel Michael came and helped him overcome the powerful "prince." The "prince" may have been Satan, but more likely he was a very powerful devil.
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Spiritually born again Christians who are indwelled with the Holy Spirit, Romans 8:9-11; 1 Corinthians 3:16; 6:19, could never have a demon possess them, but one can oppress them like that of Paul's thorn in the flesh. The Holy Spirit would not allow a demon to possess the same person He is dwelling in.
1 Peter 1:13-25; 2 Corinthians 5:17-20, God would not allow a demon to enter into one of His own as we are a new creation in Christ covered by His blood. We wage war with Satan and his demons on a daily basis, but not from within ourselves as we are of God and through Christ we have overcome them because greater is He that is in us than he that is in the world, 1 John 4:4.
Ephesians 6:10-20 we put on the full armour of God everyday in order to stand against the evil one and his demons. The believer has overcome the world of demons and nowhere in scripture does it say that one of God's own can be demon possessed