Because the early Christians were accused falsely of all sorts of outrageous behavior, Peter urged his readers in I Peter 2:11-25 to be especially careful to live such honorable lives that even their enemies would end up glorifying God. This calling was especially difficult, because they often found themselves in unfair situations that they were powerless to change, in which they suffered unjustly. Amazingly, God called them and calls us to endure unjust suffering and gave us the highest motivation for doing so: Christ already endured unjust suffering for us.
In Romans 15:14-26, Paul explained his ministry as a presentation of the nations to God though presenting the Gospel of God to the nations....
New life in Christ includes submission to governmental authorities, love for the other, and putting on Christ for all to see him.
While the Old Testament is still valid, we also have the message of the one who was raised from the dead.