Ephesians 6 "Armor"

Paul talks about God's armor in this chapter, I find that the fights hardest to fight you can't see what you are fighting.  So I guess it makes sense you should use armor you can't see either.  I especially like the helmet of salvation and the shield of faith; to me this means we should consistently focus our mind on our salvation and what Jesus did for us and our hearts on faith to balance our uncertainty in our heads.