Why is the concept of being a child of promise important for Christians?

The idea of being a child of promise is vital for Christians as it underscores the believer's identity in Christ and the divine assurance of salvation. This concept, illustrated through the allegory of Abraham's two sons, emphasizes that true heirs to God's promises are not based on human effort but rather on God's sovereign choice and promise of grace. As children of promise, believers are guaranteed a place in God's eternal kingdom, receiving all the spiritual blessings bestowed upon those who trust in Christ's finished work. This identity grants believers comfort and purpose, assuring them of their rightful place in the family of God.