I work as a Medicare broker for a living. In doing that I am constantly worried about making sure people are fully covered, leaving no gaps or weaknesses in their insurance, because I know that the smallest gap in coverage can leave someone totally exposed. So when the Lord commands us to take upon ourselves the WHOLE armor of God, I picture a similar concern. A loving God asking us to do everything in our power to make sure we are fully covered, totally protected against anything that the adversary throws out way.