What does Romans 16:26 mean?
Paul's one-sentence doxology continues. In the previous verse, he described the gospel, or good news about salvation by faith in Jesus, as a mystery kept secret by God for the long ages of human history.Now, though, he writes that it has finally been disclosed or revealed by God. Along with this revelation from God about the gospel of Jesus, it became clear that the prophetic writings—what we would call the Old Testament—pointed to this truth about Jesus all along.
The truth of the gospel message has been made known to all the nations of the world. As Paul writes this, many people in the world remain to be reached with the gospel message. His meaning seems to be that all the barriers have been removed. The truth about salvation through faith in Jesus is available to be understood and believed by everyone everywhere.
Paul adds that "the eternal God" has commanded this revelation to happen. This seems to mean both that God is the one who commanded the mystery to be ended and the truth revealed at this moment in history, and that God is the one who has commanded Paul and others to take this message to all nations throughout the world.
Why has God commanded this revelation of the gospel, the good news about Jesus? He wants people to obey Him by believing in Jesus. Salvation is more than an opportunity to be saved from hell and spend eternity with God. Belief in Jesus, in the gospel as Paul has presented it in Romans, is God's command to all peoples.