The demon possessed man was miserable for a long time. When Jesus arrived, the demons instantly recognized Him and begged him to not torment them, though they had tormented the man for years. Christians can’t be possessed. The Holy Spirit is infinitely more powerful than demons. But they can lie to and harass us. Spiritual warfare is real, and happens today. In carnal war we attack until victory is complete. In spiritual war we sit and feed on God’s promises. Then He attacks until victory is complete.