How do we know that the eternal covenant is important for Christians?

The eternal covenant is pivotal in Reformed theology, presenting God's unchanging purpose throughout redemptive history. It assures believers of God's promises, particularly the promise of salvation through Christ's atoning work. This covenant is underlined in Jude's message, where the emphasis is on holding fast to the faith once delivered to the saints. By understanding this covenant, Christians recognize their identity in Christ as sanctified and preserved by God, essential for assurance and perseverance amid trials.