It is admittedly not always as simple as just having demons cast out, but this can be a crucial part of full deliverance for some.
Since this is a testimony thread, I will share the following testimony from Derek Prince:
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“Pastor,” the young man in my office wept, “somebody’s got to help me! I can’t go on any longer.” He bent forward in the large platform chair. “Two years ago I was born again. I really love the Lord, but I still have a powerful lust for other men.”
We waited until he regained his composure.
“Before I was saved, I was a homosexual. Since then I haven’t committed that sin– but the desire is still in me, and I’m afraid I can’t keep it under control much longer. I went to my pastor for deliverance, but he says it’s impossible for a Christian to have a demon of homosexuality, and that I’ll just have to exercise discipline.”
He looked at me with distress gripping his face. “But discipline isn’t the answer! I know there’s a perverse spirit in my body. It is there! Deliverance is the only hope I have. Can you help me?” He began weeping again.
I waited until he had regained his composure. Then I explained, “I wish it were true that Christians were immune invasion. Unfortunately, our corruptible has not yet ‘put on incorruption,’ and our mortal has not yet ‘put on immortality,’ as it says in 1 Corinthians 15:54. Until that happens, our minds and bodies will still be vulnerable to the enemy. A demon can go anywhere that sin and disease can go. If a Christian can have either of these, he’s also subject o having a demon.”
He listened intently.
‘Receiving ministry today obligates you to a series of follow-up appointments in the future. This is not a one-time session. Jesus warned that when the unclean spirit leaves a person, it goes through dry places seeking rest and finds non. Ultimately it will return to the same person and try to gain reentry. If it succeeds, that person’s final condition will be worse than before. You absolutely must guard against that happening. To prevent it, you have to maintain a life of devotion to God, fellowship with other Spirit-filled believers, and sincerely read your Bible. Doing that will strengthen your relationship with the Lord.’
He agreed.
‘I want you to lean back in the chair and listen carefully to what I say,’ I went on. ‘If you comply with God’s terms, you will be set free. The Scripture promises that whoever calls on the name of the Lord will be delivered. That promise cannot fail. God will fulfill His covenant word to you. Just be certain you’re in perfect submission to Him.”
Then I led the young man in a proclamation renouncing every occult, unclean activity in which he had ever been involved. Then he verbally forgave everyone who had ever harmed him, including the men who had abused him sexually in childhood.
‘Forgiving them does not mean you agree with what they did,’ I explained. ‘It simply means that through forgiveness you cut the ropes that keep you tied to the injury they brought into your life.
‘It’s important that you understand I will be speaking directly to the spirit,’ I continued, ‘and not to you. You must listen carefully, but stay out of the way. Don’t allow the demon’s threats to intimidate you, and don’t protect it.’
He leaned back, eyes closed, as we began.
In a quiet but authoritative voice, I started quoting Scriptures to the spirit. I chose verses reminding it of Satan’s failure and Jesus’ victory. For example: ‘Inasmuch then as the children have partaken of flesh and blood, [Jesus] Himself likewise shared in the same, that through death He might destroy him who had the power of death, that is, the devil, and release those who through fear of death were all their lifetime subject to bondage’ (Hebrews 2:14-15).
I reminded the spirit that it was as powerless to hinder the success of this ministry as it had been to stop the resurrection of the Lord Jesus.
“And these signs will follow those who believe,” I told the demon, quoting Mark 16:17, “for Jesus said, ‘In My name they will cast out demons.'” And again, “‘I give you the authority to trample on serpents and scorpions, and over all the power of the enemy, and nothing shall by any means hurt you'” (Luke 10:19).
For about twenty minutes I continued quoting Scripture.
“The weapons of our warfare are not carnal,” I went on, quoting 2 Corinthians 10:4-5, “but mighty in God for pulling down strongholds, casting down arguments and every high thing that exalts itself against the knowledge of God….”
Several times the young man smiled at me with a seductive, sexy grin. Recognizing that this was merely a manifestation of the spirit, I continued. Suddenly, when I quoted Romans 16:20, “The God of peace will crush Satan under your feet shortly,” something amazing happened. The young man twisted sideways in the chair, grabbed the arm with both hands and went into a violent, epileptic-like seizure. His body lurched forward in a furious, hammering fashion, vibrating sideways at the same time. I held him around the waist, giving him as much support as I could. It was ugly. Yes, demons are ugly.
The sound coming out of him was equally astonishing. A bellowing noise, like that of a wounded bull, roared from his body. The events of Philip’s preaching in Samaria immediately came to mind: “Unclean spirits, crying with a loud voice, came out of many who were possessed” (Acts 8:7); and Jesus’ delivering the afflicted child when “the spirit cried out, convulsed him greatly, and came out of him” (Mark 9:26).
The seizure lasted several minutes as I continued to rebuke the spirit, commanding it to be quit and to go. Then, as suddenly as the seizure had begun, the young man collapsed back in the chair, physically and emotionally spent. The room became quiet. The spirit was gone.
Slowly, reverently, as in worship, the youth raised both arms over his head, weeping and laughing, “It’s gone! It’s gone! I felt it go. Praise God, I’m free! It’s gone!”
A moment later he rose from the chair, spending the next half hour walking through the offices, singing, laughing, shouting. “Thank You, Jesus! It’s gone! It’s gone! Thank You, Jesus!”
In that brief period of time, the tormented lifestyle of homosexuality ended. Only its memory would remain.
I had particular reason to rejoice with this young man. For nearly thirty years of traditional ministry, I had been unable to help people with such crushing problems. I had stood by helplessly and watched as church members were torn apart by situations that deliverance ministry could easily have solved. Some of them even died. That failure, common to most of us pastors, radically changed when I received the baptism of the Holy Spirit and learned about deliverance ministry. Thankfully this young man did not become another of my casualties. The truth had set him free.
(Derek Prince, They Shall Expel Demons, pgs. 188-191)