The Kingdom and Demons
This event is covered in detail in the Gospel of Matthew and Mark (below). See "Blasphemy against the Holy Spirit: Can I Be Forgiven?" below.
Jesus cast out demons. The enemies of Jesus did not necessarily deny that he expelled demons. However they claimed that his power toast them out came from Beelzebub. Beelzebub was the name of a heathen god, that during the age of Christ, was used as a designation for Satan (2 Kings 1:2; Matt. 10:25).
In Luke 11:17-18 we observe that unity is strength and division is weakness. If Jesus had been in league with Satan but had simultaneously worked against Satan, he would have been weakening his own Kingdom. Stein says, "That Satan's kingdom would be divided against itself because Jesus, as a servant of the prince of demons, was undermining Satan's work by liberating the demon possessed makes no sense. It is illogical." The followers of those who accused Jesus also cast out demons (Luke 11:19). If demons could only be cast out by the power of Satan, the followers of Jesus' accusers were guilty too. That the accusers did not condemn their own followers proved that their accusations were false.
Jesus' power was from God, as he is God. "The finger of God" (Luke 11:20) is the work of God himself (Exod. 8:19; 31:18; Deut. 9:10). Matthew 12:28 reads "the Spirit of God." Both phrases bring out the truth that Jesus did not drive out demons by Beelzebub. The power of God was at work in him. This points to the further truth that in the coming of Jesus, the Kingdom of God has come. The miracles he performed were evidence for those with eyes to see that God was at work. Jesus has been sent from God and that the destruction of Satan's authority as ruler of this world (cf. John 12:31; 14:30; 16:11; Eph. 2:2) means that God's Kingdom has now come (Luke 11:20).
In Luke 11:21-22 we see that Satan is like a strong man in complete control of his house (the people under his power). But Jesus is stronger (cf. Luke 3:16) than Satan and overthrows him. This is a vivid way of saying that the Kingdom of God is not simply a matter of helpful teaching; it involves the power to overcome Satan.
There can be no neutrality, and there is no middle course (Luke 11:23). The message of the Kingdom entails the possibility for the individual believer to overcome evil, and anyone who rejects this message implicitly accepts the ways of evil. Jesus made it clear that he was not referring to a moral reformation whereby a sinner puts away some evil thing but replaces it with nothing else (Luke 11:24).
The demon had left him and gone to arid places (demons were commonly thought to live in deserts). Dissatisfied, the demon returned to the place he had left, and since no one had taken his place, his reentry was easy. Note, the demon still referred to the place he had vacated as his own ("my" house). The man had cleaned up his life but had done nothing more. His heart was empty and open to any evil influence. The result was that seven demons more wicked than the first took up residence there (Luke 11:25).
Stien sums up this section saying:
This text contains important Christological and eschatological principles. The first involves Jesus' greatness. He is the "more powerful one" of whom John the Baptist spoke (Luke 3:16), for he is stronger than Satan himself (Luke 11:22; cf. also Luke 4:1-13). He is truly the Lord, the One for whom Israel had waited and longed. The master of nature (Luke 8:22-25), disease, and death (Luke 8:40-56), he is also master of demons (Luke 8:26-39), even of the prince of demons. He is therefore truly able to do immeasurably more than all Theophilus and Luke's other readers could ask or imagine (Eph 3:20).
Through this account Theophilus had also been made aware that God's kingdom had already come and that the ruler of this age had been vanquished. Luke clearly teaches a truly realized eschatology in this passage. Although God's kingdom still has a future dimension that is to be prayed for (Luke 11:2), it is in part already realized. In this passage Satan's defeat is the aspect of the kingdom already realized. In other passages the fulfillment of the Scriptures or the coming of the Spirit may be emphasized. God's kingdom has come in all of these.