Why is the adoption of sons important for Christians?

Adoption into the family of God is a significant aspect of the Christian faith, as explained in Ephesians 1:5, which states that we are predestinated unto the adoption of children by Jesus Christ. This concept underscores that believers are not merely forgiven but are welcomed into a familial relationship with God, receiving the rights and privileges of being His children. Such adoption reflects God's grace and mercy, as we were once alienated from Him. Additionally, this relationship empowers believers, assuring them of their status as children of God and heirs of His eternal promises, affirming that their salvation is secure and not dependent upon their works, but solely on God's grace.