Jesus then teaches two important truths. He first notes that if it is by the "finger of God that I cast out the demons, then the kingdom of God has come to you" (20). The kingdom of God is not just about ideas and words; it is also about power and confrontation. The children of the kingdom should expect to be involved in a power encounter with the evil one, a conflict between kingdoms that requires reliance on God's power for victory.
The second point Jesus teaches on this occasion is that God's redemptive reign as inaugurated in the person and presence of Jesus has defeated and bound the strong man, Satan. The children of the kingdom are now to participate in this great redemptive drama by plundering the strong man's stronghold. They are to reclaim lost territory by bringing back to right relationship with God what was lost in the fall. The enemy has been defeated and is bound. Although his power still operates, he has encountered someone stronger. Greater is he who is in the children of the kingdom than he who is in the world.
Page 83, emphasis mine.
This fires me up! Go plunder the strong man's plunder!!