Why is spiritual rebirth important for Christians?

In John 1:13, it is delineated that those who receive Christ are born not of flesh or will, but of God. Spiritual rebirth is essential as it represents the transformation from spiritual death to spiritual life. Without this new birth, one remains blind to their need for Christ and incapable of receiving Him. This rebirth, wrought by the Holy Spirit, is the cornerstone of salvation in the Reformed understanding, as it is through God's act that one is enabled to believe and trust in Christ. It is a divine work that facilitates a genuine relationship with God, marking believers as His children and heirs.