This is another one of those common tactics of the enemy that we see literally all the time in the ministry of deliverance. The accusing spirit is an anti-Christ spirit, because it approaches people with no love, but a tone of condemnation. It works through a voice; the voice of condemnation. It constantly tells you how much of a failure you are. It tells you how your heart is not right with God. It tells you that if you don't read your Bible every day, that you aren't serious about your relationship with God. It basically tells you that you're never good enough. This is the exact opposite nature of God. It tears down rather than builds up. The accusing spirit uses the letter of the law to lay heavy burdens and crush it's victims, just as the Pharisees would do:
The accusing spirit works hand in hand with the family of religious spirits and strongholds, including legalism.
The accusing spirit will manifest in a variety of ways. It can cause accuse a person directly, it can cause them to accuse others around them, or it can accuse God in a person's mind.
Anytime the enemy brings up your past failures, that is the work of the accusing spirit. This spirit feeds on past mistakes, in order to justify how that person is supposedly a failure, even though the Blood of Christ has washed away those failures and cast them into the depths of the sea! In this way, the accusing spirit is an anti-Christ spirit, because it deliberately writes off the work of Christ and the shed blood of Jesus.
A while back, I wrote a teaching which I highly recommend reading, it's on how to discern Condemnation versus Conviction. Who speaks the voice of condemnation? The accusing spirit! Even when the accusing spirit seems to be pointing to the answer, the burden that it lays on the person is overwhelming or irrational. For example, it may tell a person that they must go back to everybody that they have ever wronged, and apologize... then they can be forgiven. That is not only unBiblical, that is salvation by works, and God's Word tells us that if we try to be made right by works, then we have fallen from grace:
And getting us to fall from grace, that is, to stop trusting God's mercy and grace for our salvation and justification, is exactly what the accusing spirit wants to do.
As I said earlier, the accusing spirit is a voice. It speaks to us. It may even sound righteous, because it speaks of how failures are bad. It's true that failures are bad, but what Christ has done for us the a remedy to our failures. What the accusing spirit wants us to do is overlook or even discredit God's remedy for our failures! Sound like a Satanic mission? That's right! This spirit has all the makings of being righteous, even a minister of righteousness, but inside is a raving wolf seeking whom he may devour. He's busy carrying out the work of his father, the devil.
The whole motivation behind this ugly demon spirit is to discredit the work of Christ in our lives. We failed, Jesus forgave, but this spirit keeps pointing to the mistake, as if Christ did nothing to erase it! Isn't that terrible? It is SATANIC!
The fruit of the accusing spirit is widely varied. Self-hate almost always involves the accusing spirit. Guilt, and fear resulting from guilt (when you feel ashamed, you'll be afraid like Adam and Eve were when guilt drove them to hide from God). Doubt, unbelief, hate, judgementalism, critical spirit, resentment towards God, feelings of hopelessness, shame, etc. The list goes on and on.
What does the accusing spirit really want to do? Tear apart your faith and wear you down spiritually. He wants you to walk in guilt, condemnation, and never feel worthy of God's glorious plan for your life. It's goal is to wear you down, and make you weak as a child of God.
The accusing spirit thrives on repeated failures or bondages, or iniquities.Pornography or lust, for example, is a perfect example. A person can keep failing, but have their heart right before the Lord. They feel terrible each and every time they fall into that sin. Paul told us in Romans chapter 7 that he struggled with repeated failures in his own life as a Spirit-filled believer! A person who doesn't understand their bondage may have no clue that pornography is usually a bondage with roots that need to be ministered to. The accusing spirit, however, is right there to tell them how dirty and sick their mind is. This is, again, the work of the accusing spirit.
The accusing spirit is a finger-pointing spirit. It is a blaming spirit that specializes in digging up the past, and blaming somebody for it. That somebody could be you, others, or God. It works hand-in-hand with a critical spirit, or judgementalism.
Bottom line, the accusing spirit will always point to the problem (even if it's been washed away by the work of Christ), while the Holy Spirit will always point you to the solution. If there is a case of true guilt from un-repented sin, then once the person confesses it and is forgiven, the guilt should be an issue of the past. If the person continues to struggle with guilt, then (a) they have not mentally accepted the fact that their sin has been washed away, or (b) the accusing spirit is at work. Once a sin is confessed and forgiven, the Holy Spirit stops convicting, but the accusing spirit doesn't stop, but continues to badger the person over their failures. The accusing spirit will also work in conjunction with spirits of guilt, shame, condemnation, hopelessness, etc.
How do we combat this deceitful spirit? For one, we need to fill our mind with the voice of God's Word (concerning the forgiveness of sins, God's love and mercy, etc.). We need to learn to recognize the voice of the accusing spirit and cast it down.
Being that this is a spirit which builds strongholds in our minds, we need to be diligent in renewing our mind with God's Word, in order to undo the damage that it has done to our thinking patterns.
It's also possible that the accusing spirit, along with other related spirits such as religiosity, legalism, shame, etc. need to be driven out as well. You can tear down strongholds all day long, but if a spirit needs to be driven out, it will keep working against you to rebuild those strongholds.