Introduction

In the New Testament, there is no word for being “possessed” by a demon. The Greek word used is daimonizomai, which, as is easy to see, simply means to be demonized. Regrettably, most Bible translations refer to demonization as possession, but a better English word is oppression.

All sorts of arguments have arisen as a result of using the inaccurate translation of demon “possession.” Bible teachers argue that believers in Christ cannot possibly be “owned” by an evil spirit because God owns and inhabits every believer.

Or do you not know that your body is a temple of the Holy Spirit who is in you, whom you have from God, and that you are not your own? 20  For you have been bought with a price: therefore glorify God in your body. 1 Corinthians 6:19-20 (NASB) 

I fully agree that God does not share ownership of his children with the devil. However, if we approach this issue by translating the Greek word daimonizomai  as oppression, the problem disappears. Everyone knows that even Christians suffer from being oppressed at times.

Jesus taught us that the devil’s agenda is to kill, steal, and destroy. He does this work primarily through deception and fear.

When Jesus walked the earth during his itinerant ministry, Jesus quoted Isaiah 61:1 to describe his ministry. (Luke 4:18) The apostle Peter summarized our Lord’s ministry in one sentence.

You know of Jesus of Nazareth, how God anointed Him with the Holy Spirit and with power, and how He went about doing good and healing all who were oppressed by the devil, for God was with Him. Acts 10:38 (NASB) 

In this verse the word translated “oppressed” literally means “being under the power of.” This is a good way to describe demonization; although, not everyone Jesus healed had a evil spirit of infirmity. Some were just physically sick, but all sickness is a manifestation of sin’s curse and the devil’s dominion. (Click here to see what I have written about Jesus’ victory over sickness.)

The devil seeks to use people to accomplish his purposes. He works to deceive us into aligning with his God dishonoring quest. Interestingly to me, demons have a desire to inhabit people. In my opinion, this is most likely due to two reasons. First, God created us to be temples for his Spirit. Demons wish to spoil what belongs to God. Secondly, human bodies are pleasant and useful habitations for demons, giving them a place of “rest” and providing them with the means to act out their destructive desires.

Demonization can take many forms, anything from a person crawling around on the ground as a snake to being harassed in the mind by oppressive sinful thoughts and temptations. It can also include a vast array of physical problems, which Jesus commonly addressed during his public ministry – deafness, inability to speak, crippling arthritis, and epilepsy, to name a few. Demonization can also manifest itself as it did in the Gadarene demoniac (Mark 5:1-20), who lived in constant agony, alone among the tombs, cutting and generally hating himself and his condition. His pain was so great that, when he saw Jesus, knowing our Lord could set him free, ran to him and begged for help. Paul encountered and set free a young woman who had psychic abilities that came from being demonized by a spirit of “python,” which used her as its mouthpiece.

During Jesus’ day, it was not uncommon to encounter obviously demonized people. Today we generally lock such persons away in institutions and heavily medicate them into a stupor. Many others suffer in less obvious ways.

One of the devil’s chief weapons is deception. He has managed to convince a great many people that evil spirits are not even real, but were an attempt by primitive peoples to explain medical and mental problems they did not understand.

Believers who hold that the Bible is the inspired Word of God cannot dismiss the reality of demons.

In addition, if we wish to help people experience freedom, we should not quickly conclude that Christians cannot be oppressed by demons. I have seen evidence of such oppression far too often to pretend it does not exist.

When our theology does not match reality, something is wrong with our doctrine.

My goal in these articles is to help us to properly understand the scriptures regarding demonization in order to help people find freedom in Christ.

How People Become Demonized

How do demons gain access to people? Can they simply “jump on” someone? Are we helpless before them? Is there anything we can do to protect ourselves? Can we free ourselves from their oppression? These are all good questions that I will attempt to answer in this teaching.

Thankfully demons cannot randomly oppress anyone they choose.

God is sovereign, and the devil can only operate with God’s permission within the parameters set for him. (Read the Book of Job.) If demons could oppress us at will, we would see significant demonization everywhere. In general, God protects us from Satan and his servants, but certain things can open the door to demonic oppression.

Demons are all around us for sure, but for them to be able to significantly oppress us, they must somehow gain access to us. God’s protective barrier must be breached.

Solomon gave us insight into how this can happen.

He who digs a pit may fall into it, and a serpent may bite him who breaks through a wall. Ecclesiastes 10:8 (NASB) 

In general, we or someone who has protective authority over us must break through God’s protective wall by sinning in a way that opens the door to demonization.

Adam took the lead in this, but our ancestors and living members of our families, along with other authority figures, whom God gave to protect us, sometimes fail miserably at their responsibility and actually facilitate those under their care to suffer oppression.

Demons harass people several ways. It can be helpful to think of them as flies. (Interestingly, one of the devil’s names is Lord of the Flies or Beelzebub.) Flies are attracted to putrefaction and wounds. Where these two things are present, flies usually will be on hand.

One can spend his time swatting flies or removing or treating what attracted them in the first place. Over the long haul, the latter course of action will be the most effective.

Demons look for a wound, a “nest,” or a “hook” in people to set up shop. Because unhealed traumatic inner pain is so devastating, it cries out to be resolved. If we do not find healing in Christ, demons often come knocking to offer their version of assistance.

In addition to trauma, certain personal sins can be gateways to demonization.

Involvement in the occult is especially sinister. This can be something seemingly innocuous such as children experimenting with a Ouija Board. Likewise, sexual activity with demonized people can open the door to oppression.

In general, I believe that if we abandon ourselves to sins, we run the risk of demonization.

Unfortunately, we can also be demonized when others sin against us. Sexual and other forms of abuse by adults may open the door to demonic oppression in its victims. I know this does not seem “fair,” but the devil does not care a bit. He is what may be called an equal opportunity oppressor. When parents and other trusted adults fail to be protectors of those under their care, but instead open a doorway to evil in their homes, children may be scarred for life. After all, the entire human race came under the devil’s “thumb” because of the sin of Adam. Conversely, we experience freedom because of the obedience of Christ.

Sometimes demons are passed down from generation to generation.

I remember working with a woman who was experiencing recurring nightmares. During ministry, I discovered that her grandmother was trying to recruit her to take up the family tradition of witchcraft. She renounced any such involvement and claimed her freedom in Christ from this torment. The nightmares stopped immediately.

A great first step in getting rid of demons is to remove what gave them access in the first place.

A way to look at this is to imagine that we have a front and a back door to our hearts. If we kick demons out of the front door without locking the back door, what good have we done? (Matthew 12:43-45)

The first step toward gaining freedom is to close and lock the back door, the place where demons gained access to our lives in the first place. This means we must first deal with bitterness, personal sins, generational sins, lie-based strongholds, and traumatic pain. Then we will be ready to be set free.

Diagnosis Demons

Have you ever sensed the presence of an evil spirit? How did you do it? Was it a feeling? Something said? Something you saw? Were you sure about what you discerned, or did you merely have a suspicion?

Being able to accurately discern the presence and activity of the demonic in people’s lives is a very important aspect of helping them find freedom.

Trying to cast out what is not there is an exercise in frustration and confusion. Failing to discern a demon can leave it in place to continue its harassment of the individual.

Demons in general prefer to be hidden. They also sometimes can be quite bold. I remember once when a young man looked me in the eye and said that the demon in him was going to jump on me. I suppose the evil spirit did this to try to intimidate me in some way, but it didn’t work because I know who I am in Christ.

Demons use fear and intimidation when they can no longer hide.

There are two general approaches to diagnosing the presence of demons.  The first is to assume that demons should be the first thing we look for as a cause of sinful behavior or oppression. The opposing view, which I prefer, is to look for demons last of all, unless there is some reason to think otherwise. In my experience in counseling, demons are rarely the main event. They may seek to block or distract us from continuing along the road to genuine healing and deliverance. I also believe that demons get blamed for things that are more rightly attributed to the “flesh,” a lack of proper repentance and teaching, embedded lies, unhealed pain, and generational issues.

Demons, however, often lurk in the midst of the snarls of interconnected bondage issues, and we should not be surprised to find them there.

In fact, I have had more dealings with demons while engaging in Spirit-led Counseling than at any other time. This is because going deeper into people’s issues gets to roots of bondage, where demons try to hide.

But how do we know when we are dealing with a demon? Some people believe demons are behind nearly every affliction known to man. I reject this notion, preferring to limit myself to those evil spirits identified in the New Testament. However, I must admit that once when ministering to a woman who had been unable to quit smoking, I asked her if it would be okay to check out the possibility of a demon being behind her addiction. I did not think it was, but recently someone had encouraged me to consider the possibility, and I thought it would be worth a try. She agreed; so, I asked Jesus to reveal to us if a demon was involved. My wife and I commanded any evil spirit present to manifest itself somehow so we would know. Amazingly the woman immediately had a terrible taste in her throat. We concluded that this was God answering our prayer. We cast it out, and she stopped smoking immediately. I suppose God had a good laugh at my expense, but I still don’t go looking for demons behind every affliction and addiction.

I always depend on the Holy Spirit to reveal to me whatever I need to know, since I am not clever enough to figure it out on my own. This has been the secret to whatever success I have experienced doing Spirit-led Counseling over the years. I know it is his ministry, not mine.

I try to be alert for clues pointing to demonization, and, if I find any, I then ask the Holy Spirit to show me clearly what is going on. We don’t want to make a mistake. If we try to cast out a non-present demon, the person will get no relief. This may cause the person to draw one of a couple of wrong conclusions. They may think the demon is too strong for Jesus, or they may think deliverance in general does not work. Lastly they may lose confidence in our ministry to them. None of these is good. We also should never offer anyone the false hope that simply casting out a spirit will solve all their problems. The “flesh,” which is a much greater problem, remains, and it cannot be cast out.

As a matter of covering all the bases, it is good to routinely ask if the person we are counseling has ever dabbled or practiced the occult. In fact, before engaging in Spirit-led Counseling, I ask those who will be receiving ministry to complete an extensive application which asks these sorts of questions up front. There is no sense waiting until you are far into ministry before finding out crucial details.

Occult involvement will often open the door to demonization. It is the devil’s realm powered by the demonic.

My advice is to always suspect demonization when there has been occult involvement, which includes a vast array of things from Ouija boards to palm reading, from tarot cards to seances, from witchcraft to Satanic worship, and the list goes on. The application form I use covers most everything.

Discerning spirits is a gift of the Holy Spirit (1 Corinthians 12:10) and part of the ministry of Christ. It is intuitive and works differently in individuals.

I know a minister who says she can “smell” demons. Some “see” them by the Spirit. You may simply be able to know that they are there intuitively. Sometimes I am able put the puzzle pieces together to ferret out one. When I believe I have discerned the presence of a demon, I usually ask the Holy Spirit to confirm it. I sometimes command the evil spirit, if it is there, to manifest itself in some clear way under Christ’s authority and oversight, without making a scene; so that I will know. Demons must obey our commands given in Christ’s name. Sometimes I know for sure that I am dealing with a demon, but at other times I move forward on the reasoned assumption that we are dealing with one, asking for Holy Spirit confirmation. Each person must gain experience by doing the ministry. Nothing ventured, nothing gained.

In summary, we trust the Lord to show us when we are up against demonic oppression and to give us his strategy for getting rid of it.

Remember, it is God’s ministry not ours. He is the one with the wisdom, authority, and power to get the job done. We are his representatives or ambassadors.

Biblical Names for Common Demons

A once popular book, Pigs in the Parlor, presented a model which taught ministers to look for demons behind almost every resistant spiritual problem people might experience. In contrast, the Bible only acknowledges a relatively small group of demon names.

If we are going to be properly cautious and biblical, I believe we would do well limit ourselves to calling demons by biblical names.

For example, there is no biblical precedent for calling an evil spirit a demon of nicotine addiction. This does not mean that demons cannot contribute to such an addiction. I am sure they do, but being so specific is not found in the Bible.

As mentioned before, demons oppress people in a variety of ways, using fear, intimidation, and deception. Below are the names given to these spirits by the Bible.

• Demon (daimonion) – Matthew 7:22. This is the general term.
• Evil Spirit (pneuma poneros) – Matthew 12:45. This is also a general term. All demons are evil. This goes for ghosts, poltergeists, etc. There is no Casper the friendly ghost. Don’t be deceived by the current fad of ghost busting. To learn more about this, consider reading Seeing Ghosts through God’s Eyes by Mark Hunnemann.
• Unclean Spirit (pneuma akathartos) – Matthew 10:1. This is another general term, but one we in the West do not often use. The opposite of clean or holy is unclean or defiled. Unclean spirits defile what they touch. Jesus, the Clean One, cleanses unclean people with a touch. Part of his ministry was and is to drive out spirits of uncleanness.
• Spirit of Infirmity, Weakness, or Sickness (pneuma astheneia) – Luke 13:11. Some sicknesses and diseases are caused by evil spirits. We must discern whether we are dealing with a “simple” sickness or one that is demonically induced. One requires healing. The other, deliverance.
• Spirit of Fear, Timidity, or Cowardice (pneuma deilia) – 2 Timothy 1:7. Some spirits inspire fear in those they oppress. Spirits can only minister to others who they are and what they have. Perfect love (Jesus) drives out all fear.
• Spirit of Python, Fortune Telling, Divination (pneuma puthon) – Acts 16:16. Evil spirits inspire false prophecy and other forms of divination (knowing things by means of an evil source). This is one reason why we must steer clear of demonically inspired sources of information, which include Ouija boards, fortune telling tarot cards, astrology, etc.. Satan always desires to bring people into bondage through false knowledge. He will reveal just enough truth to hook people, but his ultimate desire is to enslave and destroy us by means of clever lies.
• Spirit of Slavery (pneuma douleia) – Romans 8:15. This spirit keeps people in bondage, often through fear and intimidation. Addictions may be at least partly caused by such a spirit. I believe these spirits are also at work in false religions and legalism.
• Spirit of Antichrist (pneuma antichristos) – 1 John 4:3. This is the spirit behind false worship and false messiahs. It denies Christ and inspires others to do the same.
• Spirit of Stupor (pneuma katanuxis) – Romans 11:8. This spirit seeks to dull people’s ability to hear and respond to God and the Gospel. When people start nodding off when anything spiritual is happening, it might be because of this spirit. Of course, they might be suffering from a lack of sleep, too.
• Lying Spirit (ruach sheqer) – 2 Chronicles 18:22. This spirit works to keep people deceived. Some people are motivated by this spirit to lie. Others are lied to by this spirit. In the biblical example cited, lying spirits inspired false prophets to lie to the king to induce him to take a course of action that would result in his death. Today perhaps the legacy media is the closest parallel.

What evil spirits do according to the Bible.

• Afflict – to apply pressure
• Harass – to distress or trouble
• Dispirit – to throw down
• Oppress – to exercise power over
• Torment – to make a person hurt himself and cry out
• Inflict physical problems – such as sickness, deafness, blindness, muteness, seizures
• Try to destroy – such as throw someone into a fire
• Make insane – such as the Gerasene demoniac
• Unclean spirit – Afflicts with impurity, sexual or otherwise
• Terrify – to fall upon, startle, terrify (Saul)

When we minister, one of our responsibilities is to accurately discern and diagnose what are the sources of the bondage being experienced by the people we seek to help.

If we discern the operation of an evil spirit, it is very helpful to comprehend the nature and scope of that spirit’s oppressive influence. Some believe it is necessary to name spirits by an exact name, such as when Jesus cast “Legion” out of the demoniac. This however was the exception, not the rule. Usually Jesus simply commanded the spirit using a generic name, such as unclean spirit.

We can depend on the Holy Spirit to reveal to us what we need to know and do.

Remember, demons by nature are liars and manipulators; so, we should be extremely careful when extracting information from them in a ministry session. Once we know exactly what spirits we are dealing with and how they gained access to the person, we are ready to lead him or her through the deliverance process.

How to Cast Out Evil Spirits

Evil spirits are master intimidators and inveterate liars. They will use every trick in the book to convince us that we have no ability or right to get rid of them. The usual shenanigans include telling us that they are too strong for us, are not going to do what we tell them, have a right to be there, or to try to convince us that we have some area of personal sin that disqualifies us from ministry. For this reason, before every ministry session I spend time declaring aloud and reminding myself, the person(s) with whom I am working, the Lord, and any demons present that my righteousness is derived solely from Christ, not my own performance; my authority is Christ’s authority, I am his personal representative, and Jesus is Lord over the ministry session (and everything else). I also invite the Holy Spirit to oversee everything and ask him to work in and through me to help the other person.

If setting people free from demonic oppression depended on my righteousness or my authority, I would fail, but since it solely depends on Christ, I will succeed, and so will you.

This means that evil spirits must do what we command them to do in Christ’s name. We don’t have to raise our voices or struggle in any fashion. We don’t need a band of strong men to hold down a demonized person. If we resort to such tactics, it reveals that we think that the battle is ours instead of the Lord’s and have been deceived from the very start.

The Theology of Deliverance

The theology of deliverance is simple. When Jesus died and rose again, he stripped Satan of his authority and right rule over those who are submitted to Christ.

When you were dead in your transgressions and the uncircumcision of your flesh, He made you alive together with Him, having forgiven us all our transgressions, 14  having canceled out the certificate of debt consisting of decrees against us, which was hostile to us; and He has taken it out of the way, having nailed it to the cross. 15  When He had disarmed the rulers and authorities, He made a public display of them, having triumphed over them through Him. Colossians 2:13-15 (NASB)  

And He called the twelve together, and gave them power and authority over all the demons and to heal diseases. Luke 9:1 (NASB) 

These signs will accompany those who have believed: in My name they will cast out demons, they will speak with new tongues; Mark 16:17 (NASB)

Jesus defeated Satan when he died and rose again. Drawing upon that future victory, Jesus empowered his disciples to minister in his name even before he went to the cross. How much more can we who live in the aftermath of the resurrection do the same!

The seventy returned with joy, saying, "Lord, even the demons are subject to us in Your name." 18  And He said to them, "I was watching Satan fall from heaven like lightning. 19  "Behold, I have given you authority to tread on serpents and scorpions, and over all the power of the enemy, and nothing will injure you. 20  "Nevertheless do not rejoice in this, that the spirits are subject to you, but rejoice that your names are recorded in heaven." Luke 10:17-20 (NASB)  

Today, post-resurrection, we are in “mopping up” operations in which we are enforcing the victorious reality of Christ’s lordship. As representatives of Christ, we speak and minister in his name, releasing his authority. It is the Holy Spirit’s responsibility to back up our words with God’s power. Let me repeat this essential point.

We proclaim Christ’s victory over demonic oppression, thereby releasing his authority to set captives free. The Holy Spirit then enforces what we say and makes it happen. He is the power behind the authority.

But if I cast out demons by the Spirit of God, then the kingdom of God has come upon you. Matthew 12:28 (NASB)

Casting out demons is a clear sign of the presence of God’s kingdom. Unless we understand that the Spirit is the power behind Christ’s authority, we may resort to using fleshly means to try to cast out spirits, much to the devil’s delight.

Getting Ready

During a ministry session, we should depend on the Holy Spirit to give us insight, wisdom, discernment, and whatever else may be needed. I recommend asking him to be in charge of the session. Next, bind any evil spirits in Christ’s name, commanding them aloud not to act out in any way that might hinder or distract from Christ’s work. I tell them to keep quiet and not manifest in any way, unless by permission of Christ. If we do this, we will eliminate any showy demonic displays that are intended to provoke fear and confusion. In addition, having prayed in such a way, if a demon manifests or is otherwise discerned or detected, I assume that it is God revealing to us that it is time to deal with it. Remember, demons are never the main attraction. Instead, we should be far more interested in discerning how they got there, what has kept them there, and in helping the people to whom we minister repent and renounce whatever opened the door to demonization in the first place.

Depending on the Spirit’s Guidance

Once a demon and its entry point have been discerned with the Holy Spirit’s help and any sinful behavior or beliefs renounced, it is time to cast out the evil spirit.

Jesus and Paul cast out spirits without going through these steps, but I am not usually in the marketplace when this ministry happens, as they were. I have the luxury of being able to take the necessary time to get to the root of the matter. I suppose this is another example of what the Bible calls a “variety” of ministries in the Holy Spirit. (1 Corinthians12:5) Once again, I believe we should never simply assume that we know what to do.

Always ask the Holy Spirit for guidance. Thinking we know what to do, simply because our doctrine is correct or we have ministry experience is potentially harmful.

King David knew how to fight battles, but when he went up against the Philistine armies, he asked God for a specific strategy. (2 Samuel 5:22-25) We should do the same.

Steps to Deliverance

1. Lead the person to confess and renounce any sin, wrong belief, generational sin, occult involvement, etc. that opened the door to demonic oppression.
2. Ask the person to submit to Christ. Salvation is all about lordship. James wrote that the first step toward resisting the devil is to surrender to Christ the Lord. (James 4:7) We should lead the person who needs deliverance to pray a simple prayer of surrender to Jesus the Lord, especially in the area where the evil spirit has been oppressing him or her.
3. Proclaim Christ’s victory over all the power of the enemy and over the particular spirit and area of oppression in focus. Remember: the gospel is a proclamation of Christ’s victory and Lordship which includes an invitation to be forgiven and set free from everything that has held us captive. (Acts 13:39) Saying it aloud is important. (Isaiah 61:1 and Colossians 2:15) We have no reason to think Satan can read our minds. Using our voice is crucial in gaining freedom. God uses the authority of the spoken word, enforced by the power of the Holy Spirit, to cast out evil spirits.
4. Command any oppressive spirits to leave in Christ’s name and authority. Expect them to obey because they must.

Dealing with Obstacles

Occasionally we will encounter an obstinate demon, who apparently refuses to bend the knee to our command. There could be a couple of reasons. The first thing to do is ask the Holy Spirit for guidance and go with what he shows us. Secondly, perhaps, there is yet some “hook” that we failed to discern and get the one receiving ministry to renounce, which the Holy Spirit wants us to address. Thirdly, ask the person receiving ministry if there is anything yet not covered. Fourthly, it might be profitable to command the demon to speak the truth and and ask it why it thinks it can stay. The answer might be illuminating for further ministry. Always be aware that whatever a demon says, since there is no truth in the devil, has to be judged in light of God’s Word and the witness of God’s Spirit. If another layer of sin, pain, deception, or generational devastation is uncovered, address it as before. Then go through the deliverance process again. Here is a list of potential obstacles.

• Unconfessed secret sin or vow
• Undiscovered generational sin
• Unconfessed or unrenounced occult involvement
• Agreement with a lie
• Pride – “My” demon is so strong that not just anyone can cast it out.

Remember: there is nothing a person may have done that can effectively block deliverance. It is all a smokescreen.

Always be aware that the demon simply is being obstinate and testing our faith and resolve. In this case, let us remember that the battle is the Lord’s, not ours. When I encounter this sort of thing, after going through every process listed above, I may use the approach of turning the evil spirit over to Jesus for him to deal with as he sees fit. I am not going to waste my time arguing or struggling with a disobedient demon.

How do we know when the evil spirit has departed?

The Holy Spirit operates in and through individuals in a variety of ways. (1 Corinthians 12:4-7) In my case, I often have an inner confirmation from the Holy Spirit when a spirit leaves. I don’t know how to describe it except that it seems to be a kind of inner “whoosh.” I am sure that this is not helpful to you at all, which is good, because the last thing we need to do is try to copy someone else. God can confirm that a spirit has been cast out in any number of ways.

First of all, remember that we do not even need a confirmation. We operate by faith, not by sight. (2 Corinthians 5:7) However, thankfully, God may give us an inner or external confirmation.

Often the person receiving ministry feels deliverance happening or senses the result of a spirit having left, as in a sense of release, joy, freedom, peace, etc. A minister may “see” it leave through spiritual discernment. (1 Corinthians 12:10) The person being delivered might have some sort of physical manifestation, such as coughing, gagging, etc. Regardless, we base our faith in God’s Word, whether we see any evidence or not. Demons must obey our commands given in Christ’s name. Period.

I remember a case when a person who was delivered approached me a few days later to let me know how much “lighter” she felt. In the aftermath of deliverance, she realized how much the spirit had previously affected her, even though she had been oblivious to its presence. If there is no immediate outward or inward confirmation, ask the Holy Spirit if anything more needs to be done. If everything is clear on his end, simply move on, trusting God to confirm the deliverance in whatever way or time he sees fit.

Deliverance requires faith and is usually a partnership between the one receiving ministry, the minister, and the Holy Spirit.

That is why it is very important to do whatever teaching is required up front so that the person receiving ministry has faith in the efficacy of Christ’s triumph, our authority to speak in Christ’s name, and the Holy Spirit’s power. We want to leave no room for doubt or hesitancy.

How to Maintain Spiritual Freedom

When Jesus sets us free from any kind of oppression, we have a responsibility to fight to keep that freedom. Our Lord warned us that demons, which have been cast out, seek to reenter a person to bring them into worse bondage than before, which is the last thing any of us should want.

"Now when the unclean spirit goes out of a man, it passes through waterless places seeking rest, and does not find it. 44  "Then it says, 'I will return to my house from which I came'; and when it comes, it finds it unoccupied, swept, and put in order. 45  "Then it goes and takes along with it seven other spirits more wicked than itself, and they go in and live there; and the last state of that man becomes worse than the first. That is the way it will also be with this evil generation." Matthew 12:43-45 (NASB) 

We learn several things from the above passage.

• Evil spirits find “rest” in human bodies, which motivate them to seek entrance.
• We should expect “counter attacks” after we are set free.
• We have a responsibility to fill our hearts and minds with thoughts, words, and songs related to the Lord so that there is no room for a demonic “re-infestation”.

Paul gave us a wonderful way to “inoculate” ourselves against demonization.

...be filled with the Spirit, 19  speaking to one another in psalms and hymns and spiritual songs, singing and making melody with your heart to the Lord; 20  always giving thanks for all things in the name of our Lord Jesus Christ to God, even the Father; Ephesians 5:18-20 (NASB) 

In other words, the best defense is often a great offense.

If we fill our minds, hearts, mouths, and activities with God, there will be little room for the devil.

We should be careful to make no place for the devil. (Ephesians 4:27) We cannot afford to coddle sin. It is important for us to develop good habits, which include regular Bible reading and study, prayer, worship, fasting, and speaking God’s promises and truths out loud.

We also have a responsibility to put on the “spiritual armor” provided by God by faith.

Finally, be strong in the Lord and in the strength of His might. 11  Put on the full armor of God, so that you will be able to stand firm against the schemes of the devil. 12  For our struggle is not against flesh and blood, but against the rulers, against the powers, against the world forces of this darkness, against the spiritual forces of wickedness in the heavenly places. 13  Therefore, take up the full armor of God, so that you will be able to resist in the evil day, and having done everything, to stand firm. 14  Stand firm therefore, HAVING GIRDED YOUR LOINS WITH TRUTH, and HAVING PUT ON THE BREASTPLATE OF RIGHTEOUSNESS, 15  and having shod YOUR FEET WITH THE PREPARATION OF THE GOSPEL OF PEACE; 16  in addition to all, taking up the shield of faith with which you will be able to extinguish all the flaming arrows of the evil one. 17  And take THE HELMET OF SALVATION, and the sword of the Spirit, which is the word of God. 18  With all prayer and petition pray at all times in the Spirit, and with this in view, be on the alert with all perseverance and petition for all the saints, Ephesians 6:10-18 (NASB)  

Here are the main points.

• We can only stand in the power of God’s might, truth, and authority, not our own.
• Don’t be naive. God has a plan for your life, but the devil has plenty of schemes to bring us down.
• Even though the weakness of the “flesh” is a real enemy that must be resisted, our ultimate battle is against spiritual wickedness, which requires us to use spiritual weapons.
• We must know and stand upon the truth of our imputed righteousness in Christ. Condemnation is one of the most insidious weapons of the enemy. He will use it to try to destroy our peace and confidence in God. There is no condemnation in Christ. (Romans 8:1, John 5:24)
• Being active in sharing our faith is actually one of our best weapons against the enemy.
• Faith in God and his promises shields us from enemy attacks.
• God’s truth also guards our minds from deception and fear.
• The sword of the Spirit is God’s truth found in the Bible. We can do great damage to Satan’s kingdom by proclaiming God’s Word.
• Prayer is an important defense against Satan’s strategies. As we submit to God in prayer, we can effectively resist the enemy.

But He gives a greater grace. Therefore it says, "GOD IS OPPOSED TO THE PROUD, BUT GIVES GRACE TO THE HUMBLE." 7  Submit therefore to God. Resist the devil and he will flee from you. 8  Draw near to God and He will draw near to you. Cleanse your hands, you sinners; and purify your hearts, you double-minded. James 4:6-8 (NASB) 

God encourages the grace of humility as a defense against the devil. Peter proudly announced his unfailing loyalty to Jesus before denying him three times. Don’t let pride open the door to the devil.

God wants us to be ruthless in defending our freedom. We must cut off those things that try to bring us into bondage, rather than be double-minded about it.

If your right hand makes you stumble, cut it off and throw it from you; for it is better for you to lose one of the parts of your body, than for your whole body to go into hell. Matthew 5:30 (NASB) 

This is a matter of our choice, as we rely on the motivation and power of the Holy Spirit to help us fight against evil.

Just as political liberty demands constant vigilance, it is a fight of faith to maintain our freedom in the spirit, too.

There are enslaving agents working relentlessly that must be warded off and defeated.

We also have to be vigilant against what the Bible calls the “flesh”. The “flesh” is that part of us still linked to the old creation in Adam because our bodies have not yet been resurrected. It lurks in the background, waiting for us to become tired, discouraged, disillusioned, or maybe overconfident; so, that it can try to rear its ugly head and lead us into sin. The flesh never reforms. It was crucified and rendered powerless to rule us by Christ, but we still can allow it to have power, if we like. This is a battle between flesh and spirit referred to by Paul.

But I say, walk by the Spirit, and you will not carry out the desire of the flesh. 17  For the flesh sets its desire against the Spirit, and the Spirit against the flesh; for these are in opposition to one another, so that you may not do the things that you please. Galatians 5:16-17 (NASB) 

This is not to say that we should be afraid that our slightest failure will result in demonization. However, we should not assume that reengaging in old sinful patterns will not result in our going into bondage again, either. We should have a wholesome fear of the Lord.

Maintaining short accounts with the Lord is always a good idea, too. We should make it a practice to quickly repent when we do sin, knowing that, no matter what, we always have access to the throne of grace to find help from God, especially in our time of need. Don’t fall for the lie that we must earn our way back to God.

For we do not have a high priest who cannot sympathize with our weaknesses, but One who has been tempted in all things as we are, yet without sin. 16  Therefore let us draw near with confidence to the throne of grace, so that we may receive mercy and find grace to help in time of need. Hebrews 4:15-16 (NASB) 

Finding a trusted and loving person with whom we can share our struggles can help immensely. This should be a person who will speak truthfully to us as a loving friend and confidant, with whom we can be honest about our struggles, defeats, and victories. This should be a person who will pray for us, ask us how we are doing, and be unafraid to ask pointed questions, and who will guard our confidences. Obviously, we should avoid using anyone who is a known gossip or who is so merciful that he or she would never confront. Except in the case of spouses, these persons should be of the same gender as we are.

To summarize, we should expect the devil to be a relentless enemy who will not easily give up. Be prepared for the battle and take proactive steps to defend what God has done to set us free. Always rely on God’s strength and power. Never allow condemnation to put a wedge between you and God. Keep short accounts and develop good spiritual habits. Put on God’s armor by faith and go on the offense.

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