1. The Promise versus the Law (15-22)
Paul illustrated our covenant with God by using a human example. A last will and testament cannot be added to or changed once it is put into effect. The original document must stand. In the same way, God's covenant (promise), given to Abraham was not altered with the addition of the law. So, what was the purpose of the law? It was to point out our need for the Seed-Christ Jesus. The law does not give righteousness. It is only through faith in Jesus Christ that we are made righteous by God.
2. Belonging to Christ, we are heirs (23-29)
The law existed from the time it came to Moses until the time of Christ. The law kept us prisoners. But the law had the good effect of leading us to Christ. At that point, he freed us from the law. When faith in Christ came, we became children of God who made us all united in Christ Jesus. Everyone who believes in Jesus Christ are children of God.
Application: Lord, we are your children because of Christ Jesus. Help us to know the freedom we have received in the gospel.
One Word: We are all children of God through Christ