Demons must obey Jesus Christ even when people do not, yet they resist His command and are unwilling to leave their victims. Christ could have compelled them at once, but He exercises His power with wise, gentle, and cautious concern, since the men might not have survived a sudden exorcism, as the convulsions of the boy in Mark 9:26-27 show. The demon's name, Legion, reveals a company of demons, perhaps about two thousand, each with its own personality yet united under one will and purpose, so the possessed men's plight was horrific. Christ does not send the demons into the swine; He merely drives them out of the men, and the demons themselves enter and destroy the herd by divine consent. Unclean spirits fittingly inhabit unclean swine, and the Bible records demonic entry into only two kinds of animals, the serpent and the swine. Deliverance transforms the men in five ways: they sit at rest instead of wandering restlessly; they desire to follow Christ; they are clothed rather than shameless; they regain their sanity; and they have self-control, being in their "right mind." Possession brings madness, uncontrollable behavior, and immodesty, while deliverance brings order. To avoid repossession, the cleansed mind must be filled with God's Spirit and truth. Jesus sends the healed man to witness first to his family and friends as an example of God's grace.

In the accounts of Matthew 8:28-34, Mark 5:1-20, and Luke 8:26-39, the gospels detail a significant miracle involving demon possession, where Christ delivered two men from the severe affliction caused by demons. This event is portrayed as an actual demonic possession, distinct from mere influence, with vivid descriptions of the men's tormented state, particularly in Mark and Luke, while Matthew mentions a second, less prominent individual. With a simple command, Christ freed these men from the terrible uncleanness associated with demons, demonstrating the profound power inherent in the Word of God. The uncleanness of both the men and the demons is tied to the concept of defilement, representing sin and spiritual impurity that separates humanity from God. In the gospels, those possessed by demonic spirits are described as unclean due to their constant submission to evil, a condition that contrasts with the call to holiness and righteousness for believers. The role of God's Word in this exorcism is central, showcasing its transformative power. With just a few words, Jesus commanded the demons to leave, as seen in Matthew 8:32, Mark 5:8, 13, and another instance in Luke 4:35-36, where His authority astonished onlookers. While human efforts to control such evil with physical restraints failed, Christ addressed the root of the problem internally through the unchained power of God's Word, offering a true solution to the sin and uncleanness within. This power not only liberated the possessed men but also underscores the effectiveness of divine authority over any spiritual affliction.

During His brief stay in Gadara, Jesus encountered two demon-possessed men, though accounts vary with some focusing on one prominent individual among them. The reality of the devil and his demons is evident in the gospels, where Jesus acknowledged their existence and their evil influence over human beings with serious intensity and authority. He openly declared the manifestations of evil in people's minds and bodies as originating from satan, the source of evil. Demonic powers are exercised in three ways: directly by the devil himself, through demons under his command, and via human beings whom he influences or possesses. Those who reject God's authority become subject to satan's supernatural power, allowing their personality and will to be overtaken by these deceiving, lawless spirits. In demon possession, a spiritual parasite intrudes upon the human body and mind, causing conflict and disharmony. Possession often requires a willing subject, as seen when satan entered Judas after the man opened a pathway through betrayal. Loss of self-control, immorality, sensual desires, hatred, and greed can set a person up for possession or strong demonic influence. There is a distinction between demon influence and possession. Most people experience some level of demonic influence through satan's broadcast of evil attitudes, enticing them to sin. This influence starts with subtle suggestions and can progress to full possession, rendering a person captive to the devil and sinking into degradation. Evil spirits can possess both minds and bodies, sometimes at the invitation of individuals who become familiar with these spirits. Once possession occurs, sensuality and violence become evident, and physical, mental, and spiritual disorders increase, often leading to insanity. Not all mental disorders result from demonic possession, though conditions like insanity, epilepsy, blindness, fevers, and various mental illnesses can be symptoms or aggravated by these dark powers. In the case of the Gadarene demoniac, his condition involved insanity compounded by an extreme demonic element, distinct from mere madness. Demon possession remains a reality in many parts of the world, with the devil regulating the present way of life and working in those who yield to his authority, enslaving them to his evil power.

The Syro-Phoenician woman's daughter was severely demonized, described in Matthew's account as totally insane and disabled. Her mother, unable to bring any relief, came to Jesus from a background of complete paganism, likely the worship of the mother-goddess Ashtoreth, or Astarte, the Queen of heaven, who was thought to give all life and to permit her worshippers every kind of evil. Despite that background, the woman sought divine mercy for her daughter and herself, addressing Jesus as Lord and as Son of David, and identifying her child's misery as her own. Jesus at first seemed to put her off, saying His mission was to the lost sheep of the house of Israel. He had purposely limited His personal ministry to Israel first, in preparation for the gospel going to all nations. The woman was not discouraged. Humbly accepting the place of a little dog under the table, she asked only for a crumb of mercy. Her persistent, living faith, shown in her works, led Jesus to deliver her daughter from the demon. His intervention shows that Gentiles have no less potential for salvation than Israelites, and it foreshadows the Spirit's later outpouring on both.