2Cor 10:3-5
"For though we walk in the flesh, we are not waging war according to the flesh. For the weapons of our warfare are not of the flesh but have divine power to destroy strongholds. We destroy arguments and every lofty opinion raised against the knowledge of God."
Spiritual warfare is not against people — it is against 'strongholds' (ochyromata), 'arguments' (logismous), and 'loftiness' (hypsoma). The strongholds are systems of thought that oppose the knowledge of God. Spiritual weapons (prayer, the Word, proclamation) demolish what carnal weapons cannot touch.