Galatians 3:27 - For as many of you as have been baptized into Christ have put on Christ.
Colossians 3:9-10 - ...seeing that ye have put off the old man with his deeds; And have put on the new man, which is renewed in knowledge after the image of him that created him...
The appropriation of the armor of God is through an act of Grace.
When you put on Christ, you put on that which belongs to you through Christ, Who is in you and works through you.
He is our belt of Truth.
He is our breastplate of Righteousness.
He is our preparation of the Gospel of Peace.
He is our helmet of Salvation.
He is our Sword of the Spirit, which is the Word of God.
As you put on your new identity in Christ, you are prepared with the Victory that has already been obtained for you... that Victory works its way in you and through you by Grace... God's power and ability to do in you and through you what alone only God can do.
We don't fight because we do not yet have victory... we fight because we already have the victory.
The Word, which has already defeated all the wiles of the enemy, is forever settled in Heaven.
He has already defeated the enemy. We are to walk in that which has already been secured for us by and through Christ... our Victor... who dwells and walks and lives in us.
Put off the old man... with his doubt and unbelief and wavering and insecurity and fear...
and put on the new man... who exudes faith and power and security and peace and prosperity in all things in and through Christ.