(Proverbs 25:28 KJV) He that hath no rule over his own spirit is like a city that is broken down, and without walls.
Picture this being written today. Solomon might still be talking about “walls” (2346) but they would be fire walls, not city walls. He would finish with, “... is like a computer that is hacked because it has no fire wall.”
A firewall is a device that everyone hooked up to the internet should have. It protects against the people out in the mysterious world of the internet that spend their spare time looking for computers that are not protected so they can invade and “have their way.” They call it “owning” you and your computer. They can make your machine jump through some serious hoops.
So do you have a spiritual firewall? This would involve both spiritual hardware and software. It involves the presence of the Holy Spirit and involvement with the word. Get protected.