What is the role of Christ in God's covenant?

In God's everlasting covenant, Christ fulfills the role of mediator and surety, ensuring that the promises made by God to His people are realized. As stated in Hebrews 7:22, 'Jesus has become the guarantee of a better covenant.' His sacrifice serves as the foundation upon which the covenant is established, providing atonement for sins and reconciling believers to God. This means that believers can rest assured of their place in God's family because Christ bore the penalties of the covenant on their behalf. The assurance of salvation is not contingent upon human efforts but is secured by Christ's faithful fulfillment of the covenant's demands.