Why is the covenant of grace central to understanding Isaac's story?

In Isaac’s story, we see the unfolding of God's covenant of grace. This covenant is distinct from the covenant of works represented by Ishmael, highlighting the difference between law and grace. Isaac represents the child of promise, born not through human effort but through divine intervention (Galatians 4:28). The significance of this covenant lies in its assurance that salvation is a gift of grace, not based on our works. The covenant of grace ultimately finds its fulfillment in Jesus Christ, who secures for His people the promise of eternal life. Understanding this covenant enriches our appreciation for how God operates throughout biblical history and our own lives.