What does the Bible teach about the mystery of God?

The mystery of God, as revealed in scripture, refers to the hidden plan of salvation that was made known through Christ. In past ages, the fullness of this plan was obscured, much like the understanding of the people in Eli’s time was limited (1 Samuel 3:1). However, following Christ’s death and resurrection, this mystery is made clear: God’s purpose was to redeem a people for Himself through the sacrificial work of His Son. This revelation not only clarifies God's intentions but also assures believers of their place in His family, affirming that through faith in Christ, they partake in this divine mystery of salvation.