The Gospel is the good tidings of the finished work of Jesus Christ.
The Gospel is the power by which God saves us.
We access the power of God when we renounce power over our lives and entrust our lives, our future and eternal destiny to the Gospel. When we do this we are declared righteous by God.
In God’s providence, faith is righteousness.
This is the way salvation has always come. It is the only way to salvation and to peace with God. Whether Old Testament Jew, or ancient Gentile. all who have believed God have been declared righteous by Him.
This is the thesis Paul seeks to demonstrate throughout this Book of Romans.
That Righteousness is granted to us by faith from first to last!