In the 'armor of God' metaphor in Ephesians 6, the sword, though a small weapon, could penetrate through armor. The metaphorical sword (the Word of God) is both an offensive and defensive weapon. Whatever obstacles we may encounter, we have scriptural weapons (answers) with which to defend ourselves. We need to take the time and effort to put these Scriptures in our mind so that we can draw upon them when we need them, as our Elder Brother demonstrated in Matthew 4:1-11. If we do not have a sword in our hand, Satan, his demons, and the world could move on us with a vengeance.