John Calvin Commentary Galatians 4:7

"So that thou art no longer a bondservant, but a son; and if a son, then an heir through God." — Galatians 4:7 (ASV)

Wherefore thou art no more a servant. In the Christian Church, slavery no longer exists, but the condition of the children is free. We have already inquired in what respect the fathers under the law were slaves; for their freedom was not yet revealed but was hidden under the coverings and yoke of the law. Our attention is again directed to the distinction between the Old and New Testaments. The ancients were also sons of God and heirs through Christ, but we hold the same status in a different way; for we have Christ present with us and in that manner enjoy his blessings.