What is the fellowship of the mystery in Ephesians?

The fellowship of the mystery, as described in Ephesians 3:9, refers to the unity and communion believers have with each other and with Christ. This fellowship is termed a 'mystery' because it was previously hidden and is revealed only through the gospel. All who believe are united in the Spirit, sharing the same faith and hope, which fosters a deep bond among them as part of the body of Christ. God’s grace grants this fellowship, illustrating that it is not dependent on human effort but solely on His divine revelation and purpose. Through this mystery, the church embodies the glorious plan of redemption, demonstrating the richness of Christ and the unity of His people.