Jesus saved us, and our opening text shows us what He's made us. He's reconciled you in the body of His flesh through death, to present you holy, unblameable, and unreproveable in God's sight.
This isn't something God is trying to do, or going to do; He's already done it through the death and resurrection of Jesus Christ. So, this isn't a promise; it's a statement of fact. You've been reconciled with the Father, and the latter part of the opening scripture clearly reveals to us the reason for the reconciliation: to present you holy, blameless and above reproach in God's sight.
It doesn't matter what anybody thinks about you! God says you're holy, faultless and irreproachable. This is who you are to Him. This is how He's presented you to Himself in Christ Jesus—holy, and free of all accusations.
This is where our audacity of faith comes from. This is the reason we're bold to make demands in His Name, decree a thing and have it established. It's because our righteousness is of Him! It isn't because of what you did or didn't do; no! It's because of what Jesus did.
Romans 5:17 says, "For if by one man's offence death reigned by one; much more they which receive abundance of grace and of the gift of righteousness shall reign in life by one, Jesus Christ." Stand before the mirror of God—His Word—and see that you're faultless! Look into the Word and see that you're justified, unimpeachable and free from condemnation!
Perhaps you're reading this and you're thinking, "This can't apply to me. I've been wicked and injurious to others. I've done a lot of evil things!" Don't look at what you've done.
Look at what He's done and who He's made you, and say "Yes" to Him! Embrace His righteousness, and begin to see yourself differently on the basis of this new information. His love is bigger, greater, and more powerful than the worst sin. You're valuable to Him, and He loves you dearly.