My point is this: the Law which arose four hundred and thirty years later does not repeal a will previously ratified by God, so as to cancel the Promise.

If the Inheritance is due to law, it ceases to be due to promise. Now it was by a promise that God bestowed it on Abraham.

Then what about the Law? Well, it was interpolated for the purpose of producing transgressions till such time as the Offspring arrived to whom the Promise was made; also, it was transmitted by means of angels through the agency of an intermediary

but Scripture has consigned all without exception to the custody of sin, in order that the promise due to faith in Jesus Christ might be given to those who have faith.

Now if you are Christ's, then you are Abraham's offspring; in virtue of the Promise, you are heirs.

but while the son of the slave-woman was born by the flesh, the son of the free-woman was born by the promise.

Now you are the children of the Promise, brothers, like Isaac;