To redeem them that were under the law, that we might receive the adoption as sons.
All Commentaries on Galatians 4:5 Go To Galatians 4
Augustine of Hippo
AD 430
He says “adoption” so that we may clearly understand that the Son of God is unique. For we are sons of God through his generosity and the condescension of his mercy, whereas he is Son by nature, sharing the same divinity with the Father.