When we relate ourselves to Genesis, 1:27, we each realize that “we are made in the image of God”. If so, we may assume that we are plagued with lesser versions of the beings that attack Him.
That assumption may prompt us to review Revelation 12:7-9: “And there was war in heaven: Michael and his angels fought against the dragon; and the dragon fought and his angels, And prevailed not; neither was their place found any more in heaven. And the great dragon was cast out, that old serpent, called the Devil, and Satan, which deceiveth the whole world: he was cast out into the earth, and his angels were cast out with him.”
Just as The Creation Program was plagued with corrupting viruses, so is each of us. Just as God drove the viruses from Heaven, so must we drive them from our own minds.
In effect, when we pray, we should remember to ask The Loving Programmer for the strength to do within our own minds what He did in Programming HQ. Since His angels were stronger than the viruses, He won. So, too, can we. To begin the process of purification, we have but to ask.