There is God's Kingdom, which Paul says is "righteousness and peace and joy in the Holy Spirit," in Romans 14:17.
And there is Satan's kingdom, of "the spirit who now works in the sons of disobedience." (in Ephesians 2:2) I would say that Satan's kingdom is worrying and hurrying and scurrying in his spirit of disobedience.
So, we can see that these kingdoms are spiritual. And so, spiritual warfare is involved in dealing with Satan and evil.
The kingdom of Satan's spirit is warring against God's "righteousness and peace and joy"; and this includes how his worrying and hurrying and scurrying are warring against Jesus Christ's "rest for your souls." (in Matthew 11:29)
But Jesus calls to "all" > > > "'Come to Me, all you who labor and are heavy laden, and I will give you rest. Take My yoke upon you and learn from Me, for I am gentle and lowly in heart, and you will find rest for your souls. For My yoke is easy and My burden is light.'" (Matthew 11:28-30)
Jesus says, "learn from Me". What in your actual experience have you been learning is the difference between God's Kingdom and Satan's kingdom?