"As iron sharpens iron, so one man sharpens another."
Men are sharpened for battle. Just as a dull sword is useless in combat, so is a dull man. And we know that our war is not against flesh and blood, but against the rulers, against the authorities, against the powers of this dark world and against the spiritual forces of evil in the heavenly realms. (Eph 6:12) Men, we were not made to wage war against each other. We are not each other's enemies but it is Satan himself who sows confusion among our ranks so that brother fights brother to tear each other down. Brothers, this should not be!
We were made to sharpen each other as iron sharpens iron. We were made to grow stronger together. And now, it is Christ, the man of men, the king of kings, and the lord of lords, who has bound himself to us eternally by faith. And when we are bound to him and bound to each other we will not fall but we will prevail against the enemy. Your brother is not your enemy even though he may attack you. Realize he needs the truth of Jesus Christ to set him free (John 8:32) from the true enemy's grasp so that he may join you in the fight.
Do not hate your brother and tear him down, but build him up as a fellow soldier in Christ. Offer him the Truth and set him free.