DEMON POSSESSION.

What are Demons? The definition of a demon is a malevolent spirit being, an unclean spirit, a fallen angel and comes from the Greek word "Coine" meaning "Daimonion." When we want to express the nature of their behavior, the ancient Greeks used the word "daiesthai" which literally means "to disturb" or "to divide" and denote an entity or spirit of supernatural power.
Demon possession is defined as the captive control and influence of a person by this malevolent spirit.
In Bible times demonized persons were afflicted in various ways: some were unable to speak, some were blind, some acted insane, and some possessed super human strength.
All were woefully mistreated by these invisible bullies. Men, women, and children were their victims.
Sometimes the agony was compounded when many demons gained possession of a person at the same time. When the demon was expelled, the person returned to a normal, sane state of mind.
It is quite interesting that during the beginning of Jesus' earthly ministry,  the demons themselves were the first ones to truly recognized that Jesus was more than a man, in other words Jesus' identity and addressed Him as the "Son of God," the  "Holy One of God," and "Jesus, Son of the Most High God."
However, at no time Jesus allowed them to be witnesses in His behalf. On the other hand, a man who was set free from the power of the demons was encouraged to publish to his relatives "all the things God had for him."
There is a difference between demon possession and ordinary physical sickness and disease. Jesus had the power to cure both types of disorders. Some of Jesus' greatest miracles involved the setting of possessed persons who became free from captivity to the demons. Demons were powerless against Him and shudder with fear and trepidation before Him. They know that their ultimate fate is the lake of fire.
But not everyone was happy with this demon expelling work. The Pharisees accused Jesus of being in league with the ruler of the demons, Beel-Zebub, whereas in reality, as Jesus pointed out, they themselves were the offspring of the Devil.
Jesus openly confessed that the source of His mastery over the demons was God's Spirit.  Jesus also gave authority over the demons to his 12 apostles, and later to the 70 that He sent out, so that "in the Name of Jesus" they too were able to free the demon-possessed. Even one not an immediate associate of Jesus or His apostles was able to exorcise a demon on the basis of Jesus' Name.
After the death of Jesus, the apostles continued to have this power. Paul, for example, ordered a "demon of divination" out of a slave girl, much to the anger of her money-loving owners. But when certain impostors, the 7 sons of a priest, named Sceva, attempted to cast out a demon in the name of "Jesus whom Paul preaches,"the demon-possessed man seized and severely mauled the 7 of them and stripped them naked.
We know that demons are powerful spirit beings that fell from grace and followed Satan and in their fall from grace became demons, and often the wild and uncontrolled conduct of mentally unbalanced persons is due to possession by these invisible minions of Satan.
Sometimes it is reported that spirit mediums have cast these demons out; this calls to mind what Jesus said: "Many will say to me in "that Day," 'Lord, Lord, did we not ... expel demons in your name?' And yet I will confess to them: "I never knew you!" Compelling reasons, then, for heeding the counsel, "Be watchful," and "Put on the complete suit of armor from God that you may be able to stand firm against the machinations of the Devil and his demons."
Satan and his demons know the Bible better than we do and even they believe in God and shudder so just because someone says that they believe in God it does not mean that they are saved.
So, be careful when you try to free a person from the demon power. These are nothing to mess with.
Who are we to mess with spiritual powers? Even so, I heard people who say that they are able to cast out demons but no one is ever taught to do this or told to do this anywhere in the Bible neither by the apostles nor the 70 ones that were sent out. I do not say that exorcisms do not happen but it is very clear that supernatural forces are involved in it. It is compared to playing with lightning, a very dangerous thing indeed.
We have to acknowledge the fact that even "when the archangel Michael, contending with the devil, who was disputing about the body of Moses, he did not presume to pronounce a blasphemous judgment, but said, 'The Lord rebuke you.' " Peter warns us saying, "if this is so, then the Lord knows how to rescue the godly from trials and to hold the unrighteous for punishment."
Apparently the Holy Spirit was involved in the warning given to the apostle Paul that demons would infiltrate the church and teach their own doctrines. We do not have to look very far today to see that this is happening with increased speed in many of today's churches.
The day is coming when God will finally judge these demons but he will also judge the false prophets.
It means that there are no shortages of false prophets today who claim that God speaks to them and foretells the future. If they are not right then their fate will be the same as those spirits of uncleanness or demons which is exactly what they really are.