Summary: Paul calls himself a servant of Jesus Christ. This is what we are, primarily, as Christians, whether we sit in a pew or stand in a pulpit.
In the conventions of his day, the letter writer Paul introduces himself at the beginning of his correspondence, and then mentions the ones to whom his epistle is addressed. In the case of the Epistle to the Romans, Paul’s introduction is a little longer than usual. Paul is not writing to people he knows, nor to churches which he has himself established. He is writing to a group of Christians about whom he only knows by report.
Paul calls himself “a servant of Jesus Christ.” This is what we are, primarily, as Christians, whether we sit in a pew or stand in a pulpit. We need not trumpet abroad our Christianity in a self-righteous manner, nor surround ourselves with the pomp that belongs to kings. We are servants, or, as the word is, slaves of Christ. He is our Master.
On the other hand, Paul also calls himself “a servant called to be an apostle.” Paul’s apostleship is indeed wrapped up in his calling by Christ. He was the one born out of time, who deems himself not worthy to be called an apostle because he persecuted the church of Christ. But we are what we are in Christ, and Paul was not only suddenly and wonderfully converted on the road to Damascus, but was also shown what great things he must suffer for Christ, and was named the Apostle to the Gentiles.
By definition an apostle is a messenger, a sent one. Paul was sent to preach the gospel to the Gentiles. In writing to the Romans, Paul had to walk the line between his humility as a servant of Christ, and his authority as the Apostle to the Gentiles, with full awareness that he was still a stranger to the church in Rome.
Paul also speaks of being “separated unto the gospel of God.” Being a separated one was no new concept for Paul, the former Pharisee. Paul was separated not so much from anything as to the gospel, which is here called “the gospel of God.” Such is the commitment which we should all have to the good news entrusted to us.
Paul here emphasises that the gospel originates not with men, but with God. It is God’s good news for the world of mankind. By way of parenthesis, in Romans 1:2 Paul explains how the Scriptures of the Old Testament had prepared the way for the gospel.
The gospel of God to which Paul was separated, set apart, was “the gospel of God concerning His Son Jesus Christ our Lord.”
Jesus is the eternal Son of God.
The name Jesus speaks of salvation.
The name Christ is the same as Messiah, the anointed. Jesus is prophet, priest and king.
It stands to reason that if Jesus is our Saviour, He is also “our Lord.”
Jesus, we are told, was “made of the seed of David according to the flesh.” The Gospel according to the Apostle Paul here proclaims the miracle of the incarnation. He who is the Son of God from all eternity was “made (according to the flesh) of the seed of David.” He was made man. Through Mary, He was born into the family of David. Through Joseph, He was also adopted into the royal line of King David.