What is the significance of being children of the promise?

In Galatians 4:28, Paul asserts that believers, like Isaac, are children of promise. This emphasizes God's sovereign choice and faithfulness to fulfill His covenantal promises. Unlike Ishmael, who was born according to the flesh, Isaac's birth was a fulfillment of God's promise and power. This identity as children of promise reassures believers of their secure position in Christ and highlights the assurance that their salvation is rooted in God’s commitment, not human effort. This reality frees Christians from the fear of losing salvation and calls them to live in the freedom of grace.