Our battle is not against fellow humans, it's against supernatural beings and their unseen forces. A spiritual war requires spiritual strength.

"For our struggle is not against flesh and blood, but against the rulers, against the powers, against the world forces of this darkness, against the spiritual forces of wickedness in the heavenly places. Therefore take up the full armor of God, so that you will be able to resist in the evil day, and having done everything, to stand firm." Eph. 6:11-13