His thoughts contain sound advice for spiritual warfare. Some additional thoughts from L&B:
Knowing our weaknesses, confessing them and repenting of them is an essential part of prayer.
Yet it is vitally important that we be filled and re-filled as well. The evil one waits to reoccupy spiritually empty people:
“When the unclean spirit has gone out of a person, it passes through waterless places seeking rest, but finds none. Then it says, ‘I will return to my house from which I came.’ And when it comes, it finds the house empty, swept, and put in order. Then it goes and brings with it seven other spirits more evil than itself, and they enter and dwell there, and the last state of that person is worse than the first. So also will it be with this evil generation.” (Matthew 12:43-45 ESV)
That’s the warning, but Jesus gives positive instruction as well:
What father among you, if his son asks for a fish, will instead of a fish give him a serpent; or if he asks for an egg, will give him a scorpion? If you then, who are evil, know how to give good gifts to your children, how much more will the heavenly Father give the Holy Spirit to those who ask him!” (Luke 11:11-13 ESV)
Father, help us to evict the world, the flesh and the devil, who we’ve foolishly allowed as squatters in our souls. Send us your Holy Spirit to fill us with the life of Jesus, who stands at our door and knocks.
Thank you, Father, for the grace by which you make us into Temples of the Holy Spirit and transform us into living stones built on Jesus, in whose name we pray. Amen.