The armour of God

The Breastplate of Righteousness

Ephesians 6:14 · The whole armour of God · Ephesians 6:10-18

The breastplate of righteousness in Ephesians 6:14 guards the heart, the seat of the affections and the will. It is not the fragile armour of our own good deeds, which the enemy's accusations easily pierce, but the righteousness of Christ given to us, worn as a covering over the whole chest. Because our accuser attacks us at the conscience, we need a righteousness we did not earn and cannot lose. That righteousness is Jesus himself.

Stand therefore, having your loins girt about with truth, and having on the breastplate of righteousness;Ephesians 6:14 (KJV)

The soldier's breastplate: what Paul actually pictured

The breastplate of the Roman soldier was a molded piece of bronze or a shirt of overlapping metal that covered the torso from the neck to the waist, front and back. Of all his armour it protected the most, for it guarded the vital organs, and above all the heart. A wound to the arm or leg might be survived; a blade through the chest was death. So the breastplate was heavy, costly, and never left off in battle.

Paul says we are to have on the breastplate of righteousness. In Scripture the heart is far more than the organ that beats; it is the center of a person, the wellspring of the affections, the desires, and the will, out of which, Jesus said, the whole of life flows. To armour the heart is to guard the very core of who you are. And the covering Paul names for it is righteousness, being right with God.

What the breastplate represents

There are two kinds of righteousness a person might try to wear, and only one of them will hold. The first is our own, the record of our efforts, our religious performance, our attempts to be good enough. This is the armour the enemy loves to see us trust, because it is full of gaps he knows by name. The moment he presses an accusation against it, our own conscience agrees with him, and the blade goes straight through.

The righteousness Paul means is another thing entirely. It is the gift of being counted right with God, not because of what we have done but because of what Christ has done, received by faith and worn like plate over the heart. This is a covering with no gap in it, because it is not ours. It does not depend on how we feel or how we have done today. It is a settled standing, given, and the accuser cannot pierce it because there is nothing in it to accuse.

This is the deep comfort of what has long been called imputed righteousness, though the comfort is far older than the term. My acceptance before God does not rise and fall with my spiritual weather. On the day I have prayed well and served gladly I am no more accepted than on the day I have failed and sinned and barely dragged myself back, because in neither case is my standing built on me. It is built on Christ, who does not have good days and bad days. A heart that grasps this can finally rest, and a resting heart is a guarded heart.

Why we need it: the accuser aims at the heart

The enemy is called, among his names, the accuser. When he cannot deceive us into sin, he attacks us for the sin we have already committed, pressing guilt and shame upon the conscience until we are too discouraged to stand. Every believer knows the voice: after you fall, so this is who you really are; and even after you repent, God could not truly want you now.

This is a blow aimed exactly at the heart, and only the breastplate turns it. If you meet the accusation wearing your own righteousness, you are lost before you begin, because his charges are usually true and your record cannot answer them. But if you are covered in the righteousness of Christ, you can agree that you have sinned and still stand, because your standing before God never rested on your record in the first place. The accuser has nothing to grip.

The way this works in practice is counterintuitive. The way to silence an accusation is never to deny the charge, which is usually true, but to point past it to the cross, where the charge was already answered in full. A guilty conscience says, look what you have done; the breastplate answers, yes, and look what Christ has done with it. It does not argue that we are innocent in our own eyes; it declares that we are covered, and the covered are safe. This is why maturing believers often feel their sin more keenly and are troubled by it less, both at once, for they have learned to grieve honestly and to hide fully in Christ.

How to put it on and use it

Putting on the breastplate begins with refusing to trust your own righteousness at all, either your goodness on your best days or your failures on your worst. Both are the wrong armour. Instead you take, by faith, the gift God offers, and you learn to answer accusation not with your resume but with Christ: I have no righteousness of my own to plead, and I need none, for I am covered in his.

Yet the breastplate has a second, practical edge. Paul is picturing a righteousness that is worn, that shows. A believer clothed in Christ's righteousness is meant to live an upright life, to keep a clean conscience, to walk in a way that gives the accuser no fresh ammunition. The gift of being right with God and the daily choice to do right are not rivals; the first frees you to pursue the second without fear. You guard the heart both by resting in a righteousness you cannot lose and by refusing to give sin a foothold in it.

Hold the two together carefully, because the enemy will try to split them. To some he whispers that since righteousness is a gift, holiness does not matter and sin can be indulged; to others, that since holiness matters, the gift was never quite enough and they must earn their standing after all. Both of these unbuckle the breastplate. The truth is that the gift comes first and produces the pursuit. Because I am already accepted, I am free to fight sin out of love rather than fear, and I fight it hardest precisely where I have nothing left to prove.

How it is found in Christ

The prophet Isaiah saw the Lord himself put on this same armour long before Paul described it, arraying himself in righteousness to come and save his people.

For he put on righteousness as a breastplate, and an helmet of salvation upon his head; and he put on the garments of vengeance for clothing, and was clad with zeal as a cloak.Isaiah 59:17 (KJV)

God clothed himself in righteousness as a breastplate, and in Christ he clothes us in the very same. Paul says elsewhere that God made the sinless Christ to bear our sin, so that in him we might receive a righteousness that was never ours to earn.

For he hath made him to be sin for us, who knew no sin; that we might be made the righteousness of God in him.2 Corinthians 5:21 (KJV)

There is the whole exchange. Christ took our record and carried our sin to the cross; we take his record and wear his righteousness before the Father. The breastplate is not a quality we manufacture in the heart by trying harder. It is Jesus himself, laid over us, the one perfectly righteous man given to cover the unrighteous. To put on the breastplate is to put on Christ.

This is why the breastplate can never be lost in the heat of battle, however the fight goes. It was not fastened by us and so cannot be unfastened by us, or by the enemy. On our best day it covers us no more, and on our worst day no less. To wake each morning and remember that we stand in a righteousness that is Christ's own, and not our own at all, is to have already put on the one covering the accuser can never pierce.

A note for all traditions: the armour of God is not a magic ritual or a formula of words, and the battle is not a spectacle. Paul writes soberly to ordinary believers about standing firm in Christ against real temptation, deception, and discouragement. Every piece is his gift and points back to him. The one Lord of the whole armour is Jesus Christ, and the strength to stand is his, not ours.

Related: The belt of truth · The shield of faith · The whole armour of God · Spiritual warfare · Who is Jesus?