and with your feet fitted with the readiness that comes from the gospel of peace. (Ephesians 6:15 NIV)
You can stand firm when you have the gospel of peace in your heart. When you are at peace with God nothing can knock you over. Believing in Christ and the love that He and the Father has for us gives us peace. We can be ready for anything that Satan throws our way. We can stand firm knowing that Christ died for our sins, He rose again so that we too can know that we also can live again with Him throughout all eternity. We are at peace with Christ, the Father, and the world.
Therefore, since we have been justified through faith, we have peace with God through our Lord Jesus Christ, (Romans 5:1 NIV)
Stand firm then, with the belt of truth buckled around your waist, with the breastplate of righteousness in place, (Ephesians 6:14 NIV)
The breastplate comes in two parts. It hangs off the shoulders with a plate cover the chest and stomach area and a plate that protects your back. The breastplate protects your vital organs. The same is true of the breastplate of righteousness. It protects your vital spiritual organs. It protects your heart.
Notice that truth goes with righteousness. When we have the truth about God we can live in accordance with His commands. We will have integrity of life. We take on Christ’s robe of righteousness. Satan’s assaults against us are of no affect. We can’t stand against Satan without truth and the breastplate of righteousness.
I delight greatly in the LORD; my soul rejoices in my God. For he has clothed me with garments of salvation and arrayed me in a robe of his righteousness, as a bridegroom adorns his head like a priest, and as a bride adorns herself with her jewels. (Isaiah 61:10 NIV)