"So that you maybe able to stand firm" Eph6:11B. We are told to put on the full (whole) armor of God. For what reason? That we might be able! You see with out God's armor(and the strength of God He imputes with it) we do not have the ability that we think we have. We are not that strong; be it physical, mental... Seriously think about it, we are weak. The armor gives us ability that we do not have! It has a strength that we do not have. Without it we are sitting ducks.
When it comes to battle one tends to think offensively. Attacking... But this armor is not for going out to battle... It is for us to stand! Not to just stand but to stand firm. It is for us to stand firm and not give up any ground; it is for us to stand firm and not to give in; it is for us to stand firm and not believe the lies; it is for us to stand firm and not be persuaded; it is for us to stand firm and not fall into the trap of the day; it is for us to stand firm and not give it the thinking of the era... A battle; and it is a battle because the enemy wants to take from you; he wants to steal from you: Destroy what you have; He wants to kill you. So we need to stand firm with God's full armor. We need to put on the armor of God! To protect all that God has given you.