Why is the inheritance in Christ significant for believers?

In Ephesians 1:11, Paul highlights that believers have obtained an inheritance in Christ, which is predestined according to God's purpose. This inheritance is significant because it guarantees a future hope where believers will be co-heirs with Christ, receiving eternal life and fellowship with Him. Furthermore, Peter describes this inheritance as imperishable, undefiled, and unfading, kept in heaven for us, assuring us of God's eternal promises. The significance lies in the unshakeable nature of our inheritance through Christ; since our testator lives, we can trust that it will be fully realized.