“Therefore put on the full armor of God, so that when the day of evil comes, you may be able to stand your ground, and after you have done everything, to stand. Stand firm then, with the belt of truth buckled around your waist, with the breastplate of righteousness in place,…” (Ephesians 6:13-14)
When Paul compares the armor of God with military gear, each piece represents a part of God’s strength that He extends to us when we become His children. (John 1:12) The breastplate of righteousness refers to the righteousness purchased for us by Jesus at the cross (2 Corinthians 5:21). At salvation, a “breastplate” is issued to each repentant sinner. It is specially designed by God to protect our heart and soul from evil and deception. Our own righteous acts are no match for Satan’s attacks (Isaiah 64:6). The breastplate of righteousness has Christ’s name stamped on it, as though He said, “Your righteousness isn’t sufficient to protect you. Wear mine.”
We are instructed to “put on” this armor, which implies that we do not automatically wear it all the time. Putting on the armor of God requires a decision on our part. To put on the breastplate of righteousness, we must first have the belt of truth firmly in place. Without truth, our righteousness will be based upon our own attempts to impress God. This leads to legalism or self-condemnation (Romans 8:1). We choose instead to acknowledge that, apart from Him, we can do nothing (John 15:5). We see ourselves as “in Christ” and that, regardless of our failures, His righteousness has been credited to our account.
-- From gotquestions.org
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