This gospel he promised beforehand through his prophets in the holy scriptures, concerning his Son who was a descendant of David with reference to the flesh, who was appointed the Son-of-God-in-power according to the Holy Spirit by the resurrection from the dead, Jesus Christ our Lord.
Romans 1:2-4 NET
Paul began his letter to the Romans by declaring himself to be set apart for the gospel of God. The English word “gospel” translates the Greek word “euangelion,” a word that means good news. The Roman world of the day generally used this word to announce a great military victory or a new ruler.
In the New Testament, this word refers to Jesus and his cross and resurrection. As Paul began his letter to the Romans, he introduced this gospel. Then, as the letter goes on, he continues to flesh out this gospel he proclaimed wherever he went.
The Dual Nature of Jesus
Paul touched here on the dual nature of Jesus. He had a human nature and was a physical descendant of David—the promised king of the line of David who would establish an eternal kingdom.
Jesus was also appointed the Son of God in power by his resurrection from the dead. However, this does not mean that he somehow became the Son of God at his resurrection. The gospel is about God’s Son, not his becoming God’s Son. He was already the Son of God prior to becoming a descendant of David or being declared the Son.
Instead, this expression refers to a new role that he obtained at his resurrection. He had defeated death and the grave. And now he has set down at the right hand of the throne of God (Heb. 8:1) and has become the source of eternal salvation to all who believe in him (Heb. 5:9).
The gospel is about Jesus and what he has done for us. It is not only good news. It is the best news this world has ever had. The news that God loves us and sent his Son to be the savior of the world (John 3:16). Something he became at his resurrection. And all who will believe in him will have eternal life.