Commenting on Romans 1:1-6 and the phrase “the gospel of God.”
The Christian good news is “the gospel of God.” The apostles did not invent it; it was revealed and entrusted to them by God.
This is still the first and most basic conviction which underlies all authentic evangelism. What we have to share with others is neither a miscellany of human speculations, nor one more religion to add to the rest, nor really a religion at all. It is rather “the gospel of God,” God’s own good news for a lost world. Without this conviction, evangelism is evacuated of its content, purpose and drive.
John Stott, The Message of Romans, 48