The sermon opens with a story of a driver pulled over by police in America not for any traffic violation but because, despite a bumper sticker reading "Jesus loves you," he had just cursed and raged at another driver who cut him off — the officer suspected the car was stolen because the driver's conduct didn't match the claim on his bumper. The preacher uses this to introduce the world's basic expectation of Christians: that they are people who are good, loving, and righteous. That expectation isn't wrong, but the sermon argues that righteousness — the breastplate in Ephesians 6:10-14's whole armor of God — must first be understood as something God has done for believers, not something they achieve. Before the armor is something to "take up" and use in battle (verse 13), it is first something to "put on" (verse 11), an identity God gives, like a new set of clothes that grants a new identity, the way Superman's suit makes him Superman.

The sermon roots this in Isaiah 59:16-20, the background of the whole-armor imagery. There, God himself is the Divine Warrior who puts on righteousness as a breastplate because "he saw that there was no one to intervene." Israel's confession of sin (v.12) shows that even God's own covenant people are guilty, and Isaiah 64 later says even the best human deeds are like filthy rags. So the Divine Warrior does not merely defeat Israel's political enemies like Babylon; ultimately he comes to defeat sin itself, the true enemy ruling every human heart. In the New Testament, this warrior triumphs not by the sword but in weakness — God in Christ enters a frail human body and dies on the cross, and by that death makes it possible for those in Christ to wear the breastplate of righteousness, no longer condemned but reckoned righteous.

The theological center of the message is 2 Corinthians 5:21: "he made him to be sin who knew no sin, so that in him we might become the righteousness of God." The sermon calls this the "Great Exchange" or "double imputation" — Christ, the only person who ever perfectly obeyed the Father and pleased him completely, was charged with human sin and bore its punishment, while those united to him by faith are credited with his perfect righteousness, as if their bank account balance were made infinite by his account. The sermon calls this exchange a "travesty of justice" in the deepest sense — a perfectly innocent person condemned while the guilty go free is the ultimate injustice by any human standard, even by Proverbs' own condemnation of acquitting the guilty and condemning the innocent — yet this is precisely what God accomplishes for sinners in Christ. The story of the woman caught in adultery (John 8) illustrates this: Jesus alone had the moral standing to cast the first stone, yet he chose not to condemn her, foreshadowing how the only sinless one bears sin's penalty instead of inflicting it. Isaiah 53:4-6 is read to reinforce that "the Lord has laid on him the iniquity of us all."

Having established that righteousness is God's gift, the sermon turns to how this truth arms believers against two specific satanic attacks. First, Satan accuses believers that God cannot really love them given their repeated failures — the answer is that Christ died for us while we were still sinners, so God's love was never contingent on our performance in the first place. Second, and paradoxically, Satan then flips the same truth into license: if God loved you as you are and died for you while you were weak, why not just keep sinning? The sermon (using an aside about a fringe Australian political party gaining unexpected support from voters who no longer trust the major parties, as an analogy for how easily people distrust good intentions) answers that God loves us too much to leave us as we are; he wants his church to be radiant, holy, and blameless, not because he demands more from us but because that is genuinely best for us, just as Adam and Eve were deceived into doubting God's good intentions.

Finally, the sermon presses toward practice: Ephesians 5:8-9 calls believers, once darkness but now light, to bear the fruit of light — goodness, righteousness, and truth — living consistently with their new identity rather than the exhausting hypocrisy of a double life. The chief practical application offered is forgiveness: Ephesians 4:26-27 warns against letting anger fester and giving the devil a foothold, and 2 Corinthians 2:10-11 urges forgiving one another so that Satan, whose design is only ever to destroy marriages, friendships, and churches, gains no advantage. Wearing the breastplate of righteousness, the sermon concludes, means both resting in Christ's imputed righteousness and actively practicing it, especially through a readiness to forgive.

Bible Verses Used

• Isaiah 59:12, 16-20: background for the whole armor of God; the Divine Warrior puts on righteousness as a breastplate because no one else could intervene against sin.

• Ephesians 6:10-14: the sermon's main text — believers are to put on and take up the whole armor of God, including the breastplate of righteousness.

• 2 Corinthians 5:21: the sermon's theological center — Christ made sin for us so that we might become the righteousness of God, the "Great Exchange."

• Isaiah 53:4-6: read to show that the Lord laid the iniquity of us all on Christ, the substitute who bore our sickness and transgression.

• John 8 (the woman caught in adultery): illustrates that Jesus alone was qualified to condemn yet chose grace, prefiguring the sinless one bearing sin's penalty.

• Ephesians 5:8-9: applies the breastplate practically — as children of light, believers bear the fruit of goodness, righteousness, and truth.

• 1 John 3:10 (referenced): practicing righteousness is evidence of being God's child, contrasted with the children of the devil.

• Ephesians 4:26-27: warns against nursing anger, since unresolved anger gives the devil an opportunity.

• 2 Corinthians 2:10-11: urges forgiveness so that believers are not outwitted by Satan's designs to destroy relationships and the church.