My point is this: An agreement already ratified by God cannot be annulled and its promise canceled by the Law, which arose four hundred and thirty years later.

If our inheritance rests on the Law, it has nothing to do with the promise. Yet it was as a promise that God bestowed it upon Abraham.

Then what about the Law? It was a later addition, designed to produce transgressions, until the descendant to which the promise was made should come, and it was enacted by means of angels, through an intermediary;

And if you belong to Christ, then you are true descendants of Abraham and his heirs under the promise.

But the child of the slave-girl was born in the ordinary course of nature, while the child of the free woman was born in fulfilment of the promise.

Now we, brothers, are like Isaac, children born in fulfilment of the promise.