Four of Christ's thirty-three miracles involve the casting out of demons, demonstrating His power over the forces that oppose God's work. During the years of Jesus' ministry, there was a notable increase in demonic activity as satan sought to counter God's efforts. Demon possession occurs when one or more demons inhabit a human or even animals, often accompanied by mental and physical diseases due to the demons' destructive desires toward the bodies they occupy. In the synagogue, Jesus performs an exorcism, casting out a demon on a busy day that also includes teaching and healing. Later that evening, many from the city bring the sick and demon-possessed to Him at Peter's house, further showcasing His authority and compassion. The demon in the synagogue is described as an unclean spirit, reflecting moral impurity and a contrary attitude, recoiling violently when faced with Christ's holiness and crying out in fear. Demons invade people by overriding their conscious personality, allowing the unclean spirit to speak through them. They resentfully lust for victory over humanity, and though God limits possession, He often allows demons to heavily influence individuals, contributing to the unclean spiritual condition of society. The demon in the synagogue recognizes Jesus as the Holy One of God, but He prohibits its testimony, refusing to accept witness from such a lying, diabolical source, maintaining no association with evil. Jesus expels the unclean spirit with a direct command backed by God's authority, ordering it to hold its peace, akin to muzzling it. The demon obeys in rage and anguish, unable to resist. No man can cast out demons by his own power; even the archangel Michael relied on God's authority to rebuke satan. Similarly, Paul, in the name of Jesus Christ, commands a spirit to leave. The people in the synagogue are amazed and fearful, astounded by the power of God's Word as Jesus simply commands the demon to depart, unlike contemporary methods that relied on prayers or chants. Christ authoritatively orders demons to come out, demonstrating the defeat of evil through His command.

Of the references in the gospels to miracles performed on demon-possessed people, only a few are personal, such as the exorcism found in the parallel accounts of Matthew 8:28-34; Mark 5:1-20; and Luke 8:26-39. In this case, it is emphasized that it was an actual demonic possession, not just demonic influence. Mark and Luke describe one of the demon-possessed men quite graphically, while Matthew includes a less prominent companion who was similarly afflicted. With a word of command, Christ was able to deliver these two men from the terrible uncleanness that demons cause. The working of this miracle by the Word of God should give us a deep respect for and submission to God's commands. Christ was met by the unclean men coming out of the tombs. These rock-hewn tombs were repulsive to the Jews and to dwell in them was deemed a sign of insanity. Because of the remains of the dead they contained, they were shunned by the Jews as unclean. Under the Old Covenant, one could be physically defiled by touching a dead body. Even when a person died in a tent, the whole tent was regarded as unclean. Unclean in Scripture means to be defiled, polluted, unhealthy, or unfit, and refers to foods that are unfit, defilement of religious character, and moral or spiritual impurity. The word defilement describes a sinful and unfit condition. The Old Testament distinguishes between what is clean and helpful and what is unclean and unacceptable. The New Testament deals more with the spiritual application and lists uncleanness or moral defilement along with fornication and other sins as works of the flesh. In the gospels, unclean describes those who are possessed by demonic spirits through constant submission to evil. Uncleanness represents sin, and sin separates man from God. Because of sin, we are all like an unclean thing. Believers are not called to uncleanness but to live in holiness. We are not to yield our members to uncleanness but to righteousness and holiness. The teaching about uncleanness springs from the concept of God's holiness. It is a miracle in itself that freedom from uncleanness and guilt is possible through God's grace. Holiness within, purity of heart, is possible through the exercise of faith in Christ's redemptive work and obedience to His truth. There is great power in the Word of God. It can transform a person dramatically, working mightily in those who have faith in Christ. No one could have as big a problem as these men possessed by a legion of demons. Nevertheless, it took only a few words from Jesus to deliver them. In Luke 4:35-36 is another example of Jesus using the power of God's Word to exorcise demons: But Jesus rebuked him, saying, Be quiet, and come out of him! And when the demon had thrown him in their midst, it came out of him and did not hurt him. Then they were all amazed and spoke among themselves, saying, What a word this is! For with authority and power He commands the unclean spirits, and they come out. The world tried many ways to restrain and control the two demon-possessed men in Gadara, but the only effective solution was God's power through Christ. Man's idea was to start on the outside with chains and other bonds, but Jesus began on the inside with the Word of God, which is not chained. Using their various programs to deal with evil, people only treat the symptoms. The best they can do is whitewash the outside. Christ corrects the problem at the source. So Christ is the solution, the remedy for the sin. He cleans out the inside, which is the best way to correct the problem on the outside. When we study and accept the Word of God, we draw closer to the One who can give us access to the knowledge and power to conquer our spiritual enemy. Hebrews 4:12-13 reads: For the word of God is living and powerful, and sharper than any two-edged sword, piercing even to the division of soul and spirit, and of joints and marrow, and is a discerner of the thoughts and intents of the heart. And there is no creature hidden

Demons must obey Jesus Christ's command to leave their victims, even when people do not obey Him. In the case of the two Gadarene men, the demons object and are unwilling to abandon those they possess. Christ could have compelled them out at once, but the men may not have survived the exorcism on their own strength. In a separate incident (Mark 9:26-27), a single demon convulsed a man so violently that he seemed dead until Jesus lifted him up. Both exorcisms remained under Christ's control, and He used His great power with wise, gentle, and cautious concern. Though Jesus addresses a single spirit, the name Legion shows a company of demons, perhaps the two thousand swine of Mark 5:13, each with its own personality yet united under one will and purpose. Christ does not send the demons into the swine or drive the swine into the sea. He only casts the demons out of the men, and the demons act by divine consent. The loss of the swine may be judgment on owners who violated God's law on unclean meat (Leviticus 11:4-8). Exorcism produces visible change in the delivered: rest in place of restless roaming, devotion to Christ, clothing and modesty, restored sanity, and self-control. Since an emptied house invites a returning spirit (Luke 11:24-25), the delivered person must fill his mind with God's Spirit and truth. Jesus then sends the healed man to witness first to family and friends as an example of God's grace.