In Ephesians 6: 12 we see that… we wrestle not against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high places.
The word teaches us that these evil spirits are fallen angels who have been dethroned by the Lord Jesus. Our contact with these demons should be with the knowledge that Jesus has defeated them, spoiled them, put them to nought (Col. 2:15). And now that Jesus has dethroned then, we can reign over them.