The Mystery of the Gospel
When Paul refers to "the mystery of the gospel," he is describing the entire message of salvation as a mystery that was planned by God, hidden for ages, and now publicly proclaimed. This phrase appears in Ephesians 6:19, and a closely related concept closes the letter to the Romans in 16:25-27.
Ephesians 6:19
"...and also for me, that words may be given to me in opening my mouth boldly to proclaim the mystery of the gospel."— Ephesians 6:19 (ESV)
This verse comes at the end of Paul's description of the "armor of God." After listing all the spiritual equipment a believer needs, Paul asks for one specific prayer: that he would have boldness to proclaim the mystery. The gospel is not just good advice or moral teaching. Paul frames it as a mystery — a truth that was hidden in the mind of God and has been revealed at just the right time. The gospel requires proclamation precisely because it could not have been guessed.
Romans 16:25-27
"Now to him who is able to strengthen you according to my gospel and the preaching of Jesus Christ, according to the revelation of the mystery that was kept secret for long ages but has now been disclosed and through the prophetic writings has been made known to all nations, according to the command of the eternal God, to bring about the obedience of faith."— Romans 16:25-26 (ESV)
This closing doxology in Romans gathers several key threads of Paul's mystery theology into one dense statement. The gospel is "the revelation of the mystery." It was "kept secret for long ages." It has "now been disclosed." And it has been made known "to all nations" — connecting the gospel mystery to the mystery of Christ and Gentile inclusion.
The Gospel as Revealed Wisdom
In 1 Corinthians 2:7, Paul speaks of "God's wisdom, secret and hidden, which God decreed before the ages for our glory." Although the exact phrase "mystery of the gospel" does not appear here, the concept is the same. The gospel is a form of divine wisdom that the world could not discover on its own. Paul says that the "rulers of this age" did not understand it — if they had, "they would not have crucified the Lord of glory" (1 Corinthians 2:8).
This frames the gospel not merely as information to be received but as a kind of wisdom that stands in contrast to all human systems of power and knowledge. See Paul and the Mystery of God for the broader context of this theme.
Mystery of the Gospel vs. Mystery of Christ
These two phrases overlap but are not identical. The mystery of Christ focuses specifically on the identity of God's people — that Gentiles are fellow heirs in one body. The mystery of the gospel is broader: it encompasses the entire plan of salvation, including Christ's death and resurrection, justification by faith, and the offer of salvation to all people. The mystery of Christ is a major component of the mystery of the gospel, but the gospel-mystery includes the full scope of God's saving work.
The Role of Proclamation
A recurring theme in these passages is that the mystery must be proclaimed. It is not a secret to be hoarded but a revelation to be announced. Paul asks for prayer specifically so he can speak boldly. In Colossians 4:3, he asks for an "open door for the word, to declare the mystery of Christ." The revealed mystery creates a missionary obligation. See Stewards of the Mysteries of God for more on the responsibility of those entrusted with this message.