In the name of Jesus, I put on the whole armor of God, that I may be able to stand against the wiles of the devil; for I wrestle not against flesh and blood, but against principalities, powers, the rulers of the darkness of this world, and spiritual wickedness in high places.

Therefore, I take unto myself the whole armor of God, that I may be able to withstand in the evil day, and having done all, to stand. I stand, therefore, having my loins girt about with truth.

Your Word, Lord, which is truth, contains all the weapons of my warfare, which are not carnal, but mighty through God to the pulling down of strongholds.

I have on the breastplate of righteousness, which is faith and love. My feet are shod with the preparation of the Gospel of peace. In Christ Jesus, I have peace and pursue peace with all men. I am a minister of reconciliation, proclaiming the good news of the Gospel.

I take the shield of faith, wherewith I am able to quench all the fiery darts of the wicked; the helmet of salvation (holding the thoughts, feelings, and purpose of God's heart); and the sword of the Spirit, which is the Word of God.

In the face of all trials, tests, temptations, and tribulation, I cut to pieces the snare of the enemy by speaking the Word of God. Greater is He that is in me than he that is in the world.

Thank You, Father, for the armor. I will pray at all times—on every occasion, in every season—in the Spirit, with all [manner of] prayer and entreaty. To that end I will keep alert and watch with strong purpose and perseverance, interceding in behalf of all the saints. My power and ability and sufficiency are from God Who has qualified me as a minister and a dispenser of a new covenant [of salvation through Christ]. Amen.

Scripture References
Ephesians 6:11-14, Psalm 34:14
John 17:17, 2 Corinthians 5:18
2 Corinthians 10:4, Ephesians 6:16,17 Amp. 
Ephesians 6:14,15 Amp., 1 John 4:4
Ephesians 2:14, 2 Corinthians 3:5,6 Amp. 

Source: Prayers That Avail Much Vol. One by Germaine Copeland.
Excerpt permission granted by Harrison House Publishers