I believe we are fighting devils in high places. Daniel 10:12 "Then said he unto me, Fear not, Daniel: for from the first day that thou didst set thine heart to understand, and to chasten thyself before thy God, thy words were heard, and I am come for thy words. 13 But the prince of the kingdom of Persia withstood me one and twenty days: but, lo, Michael, one of the chief princes, came to help me; and I remained there with the kings of Persia." The angel speaks with Daniel about the difficulty he had in bringing the message. You can see that there is warfare in the spiritual.