What does it mean that Christ is our eternal mediator?

As our eternal mediator, Christ stands between God's justice and our guilt, representing us as He fulfills the covenant requirements. His mediation is unique because He is both fully God and fully man, which allows Him to bridge the gap caused by sin. This role guarantees that believers are united with Him and thus considered justified before God. The acknowledgment of Christ as our eternal mediator emphasizes the completeness of His work and the assurance that those united to Him have their sins covered eternally, reinforcing the idea that our justification is securely anchored in Christ's atoning sacrifice.