Matthew 12:28
But if it is by the Spirit of God that I cast out demons, then the kingdom of God has come upon you. The positive statement of what Jesus' exorcisms mean: if the exorcisms are by the Spirit of God — which the Isaiah Servant Song citation (verse 18) has just established — then the kingdom of God has arrived. The kingdom's arrival is evidenced precisely by the expulsion of demonic forces from human lives. The Pharisees who attributed the exorcisms to Satan were rejecting the evidence of the kingdom's presence.