How does the New Covenant affect the believer's assurance of salvation?

The New Covenant directly affects a believer's assurance of salvation by anchoring their confidence in the unchanging nature of God's promises and the completed work of Christ. In Ephesians 1:3-6, believers are reminded of their chosen status in Christ before the foundation of the world, emphasizing that salvation is purely an act of God’s grace. This assurance is not contingent upon the believer's works or failings, as the covenant is rooted in the glory of God and His faithfulness. Furthermore, because Christ is continually mediating this covenant, as detailed in Hebrews, believers can be assured that their salvation is secure and that they will ultimately receive the eternal inheritance promised to them. Thus, their assurance comes from relying on God’s faithfulness rather than their own performance.