What does the Bible say about adoption as sons of God?

In Galatians 4:1-7, the Apostle Paul explains that through faith in Christ Jesus, believers are adopted into God's family. This concept of adoption signifies not only a change in status but also reflects our intimate relationship with God as 'Abba, Father.' As heirs according to promise, we enjoy privileges and responsibilities within God's kingdom, including unity among believers and the indwelling of the Holy Spirit who confirms our identity as God's children. This adoption is purely by divine grace, initiated by God when the fullness of time came to redeem us from the law.