Galatians 3 (The Message)
Trust in Christ, Not the Law
15-18Friends, let me give you an example from everyday affairs of the free life I am talking about. Once a person's will has been ratified, no one else can annul it or add to it. Now, the promises were made to Abraham and to his descendant. You will observe that Scripture, in the careful language of a legal document, does not say "to descendants," referring to everybody in general, but "to your descendant" (the noun, note, is singular), referring to Christ. This is the way I interpret this: A will, earlier ratified by God, is not annulled by an addendum attached 430 years later, thereby negating the promise of the will. No, this addendum, with its instructions and regulations, has nothing to do with the promised inheritance in the will.
The promises of God to Abraham and to his seed (Jesus) are for us only through Jesus and not through the law. The promises cannot be cancelled by the law that came 430 yrs later. So if we have Jesus, then the promises to Abraham are for us too. This is good news.