And take the helmet of salvation,
The Roman helmet worn during the first century was of unique construction. It was designed to give the illusion of height, making the soldier even more intimidating. It was outfitted with neck and ear guards. It was also reinforced inside with several metal rods to protect the soldier from a weapon called the falx. This three-foot, curved blade mounted on a three-foot wooden handle was a deadly “slash and sever” weapon. One swipe with the curved blade could sever a limb or instantly decapitate an enemy. Or a blow brought down upon the head could easily split it in half. The metal rods kept this from happening.
Here, Paul warns his readers that the head will be a particular target. If the enemy could keep the Ephesians from being transformed through the renewing of their minds, if he could whisper lies in their ears, he could be victorious. Paul’s answer was to walk constantly and purposefully in the firm knowledge of their salvation.