The Armor of God in Ephesians 6: meaning, pieces, and Old Testament roots

The closing summons of a letter about unity

Ephesians is a sweeping letter about how God is reconciling a fractured world in Christ and forming one new community of peace. Only at the very end of the letter—in chapter 6, verses 10 to 18—does Paul introduce the famous metaphor of the armor of God. Like Philippians, Ephesians is one of the prison epistles, written while Paul was chained to a Roman soldier (Ephesians 6:20). Yet when Paul looks at a soldier's gear, his mind also goes back to the Hebrew prophets—especially Isaiah 59:17, where God Himself puts on righteousness as a breastplate and salvation as a helmet. It is called the armor of God because these qualities belong first to God Himself.

Walking through Ephesians 6:10–18

The call to stand in borrowed strength (Ephesians 6:10–13)

Paul opens the passage by urging his readers to be strong in the Lord and in the power of His might, and to put on the whole armor of God. Notice that the repeated command in verses 11, 13, and 14 is not "attack," but "stand." Moreover, every imperative in the Greek text is plural—addressed to the whole congregation standing shoulder to shoulder, not to an isolated individual fighting alone.

Belt, breastplate, and shoes of peace (Ephesians 6:14–15)

The first three pieces of equipment are worn fastened to the body:

• Loins girt about with truth (6:14a): Just as a soldier's belt gathered up a loose tunic for movement, candor and God's truth hold a believer's life together without duplicity.
• The breastplate of righteousness (6:14b): Echoing Isaiah 59:17, both the right standing God gives and integrity of life guard the heart from accusation and cynicism.
• Feet shod with the preparation of the gospel of peace (6:15): In a striking paradox, the footwear of this spiritual soldier is not aggression, but readiness to carry the good news of peace (echoing Isaiah 52:7).

Shield, helmet, sword, and unceasing prayer (Ephesians 6:16–18)

The second set of items moves to what a soldier takes up in hand and wears into the field:

• The shield of faith (6:16): The word Paul uses refers to the large rectangular door-shield that soldiers locked together to extinguish flaming darts. Trust in God's character quenches sudden arrows of fear, doubt, and accusation.
• The helmet of salvation and the sword of the Spirit (6:17): Hope in God's saving work protects the mind, while the only offensive weapon in the entire list is the word of God—truth spoken in the power of the Spirit rather than human force.
• Praying always in the Spirit (6:18): The metaphor of armor dissolves directly into prayer and watchfulness for all the saints, showing that prayer is the atmosphere in which every piece of the armor is worn.

Questions to carry into your reading

As you read Ephesians 6, reflect on how this passage applies to everyday life:

• How does knowing that these pieces first belonged to God in the book of Isaiah change the way you think about "putting on" the armor?
• Why is it significant that the shoes of a Christian in conflict are described as the readiness of the gospel of peace?
• Who around you needs the kind of watchful, persevering prayer Paul describes in verse 18?

Keep reading

Explore passages on strength in the reading room, read our study on reading the Bible in context from Philippians 4, or see how Paul describes character in the Fruit of the Spirit in Galatians 5.