Why is the concept of mystery significant in the gospel?

The concept of mystery in the gospel is significant because it underscores the hidden and divine plan of God that has now been disclosed to His people. In Ephesians 3:4-5, Paul highlights that this mystery was not fully understood or accessible in previous generations, but it has been made manifest to His saints. This revelation includes the truth that Christ dwells within believers, a profound reality that demonstrates the intimate relationship between God and His chosen ones. This mystery, being revealed, assures believers of their reconciliation and restoration, which is central to the gospel message.