Matthew 9:32 As they were going away, behold, a demon-oppressed man who was mute was brought to him. 33 And when the demon had been cast out, the mute man spoke. And the crowds marveled, saying, "Never was anything like this seen in Israel." 34 But the Pharisees said, "He casts out demons by the prince of demons."
What is a demon? A demon is a created angel that rebelled against God during the early years after being created about 6200 years ago. Revelation 12:3-4,7-9 reveals to us that Satan and one third of the angels rebelled against God and were thrown down to earth to deceive and destroy people. The Apostle Paul tells us clearly that our battle is not against flesh and blood (people), but against the powers of darkness, Satan and his demons (Ephesians 6:12). He instructs us that people who are disobedient to God follow the prince of the power of the air, the spirit at work in them (Ephesians 2:1-3). The prince of the power of the air refers to the devil and his demons. In 2 Corinthians 4:4 we are told that Satan, the god of this world blinds the minds of unbelievers to keep them from seeing the light of the gospel in the face of Christ.
What can demons do to humans? In Matthew 9:32-33 the demon was able to keep a man from talking. In Luke 8:26-29 we are told that the demons caused a man to live among the tombs naked and to have enough strength to break chains he was bound with. Satan bound a woman with a disabling spirit for 18 years causing her to be bent over unable to straighten herself (Luke 13:11,16). Demons were able to cause a boy to have convulsions and throw himself to the ground (Luke 9:39,42). Satan is able to move people to attack and kill people, cause natural disasters and take a person's health away (see Job 1:13-20; 2:4-7).
Satan is able to speak untruth into our minds according to 2 Corinthians 2:11. The Greek word translated "designs" or "schemes" means "concepts of the mind".
Our passage shows us Jesus has power over Satan and demons. James teaches us that in Christ we have power over demons, "Submit to God, resist the devil and he will flee from you." (James 4:7). The Apostle Peter teaches us that Satan is like a roaring lion seeking to devour God's people. He tells us to resist the devil by standing firm in our faith (1 Peter 5:8-9). The Apostle Paul tells us to stand firm against the devils schemes by putting on the full armor of God, the truth of Scripture and pray (Ephesians 6:10-18). The Apostle John instructs us in Revelation 12:11 that we conquer demons by the blood of the Lamb (Jesus) and by our testimony of our relationship with Jesus Christ.
Religious leaders attribute the acts of Jesus to Satan . The Jewish religious leaders were called children of the devil by Jesus (John 8:44).
We, as believers in Jesus, need to remember who our battle is against. We battle Satan and demons who at times work through people. We do not battle against people. We need to remember how to win the war against the devil and his unclean spirits (demons). We win the war by living according to the truth by faith in the Son of God. Are you learning the truth? Are you attempting to live the truth expecting Jesus to fulfill your attempt with His power? If you answer, "Yes", to those questions, then you will win the war against Satan. If you answer, "No", then you are being defeated by Satan.