Each person's life advances the purposes of God or the purposes of Satan. The kingdom of God and the kingdom of Satan are not merely in conflict. The purposes of God and the purposes of Satan are in total conflict. The Bible always contrasts God and Satan's purposes. At its heart, the conflict concerns purpose.
Purpose is the central issue of life.
There is not God's kingdom, Satan's kingdom, and a neutral kingdom. Committing to a third kingdom is not an option. Charles did not apply this insight to others. He said each Christian needs to apply it to self. Everything that occurs in my life benefits either the purposes of God or the purposes of Satan.