In a soldier's armour, the helmet is a vital part of survival because it protects the head, where the command center of the whole body is located. If it is damaged, the whole body may be of little to no use. In a Christian perspective, the helmet of salvation protects the believer's mind from the attacks of the enemy. This helps a believer against the attacks and interference of Satan because he usually goes after the mind. Be protected from distortions and denials from Satan. Focus your mind always on things above. Look unto Jesus, the Author and the Finisher of our faith.