27. For it was written: "Rejoice, O barren one, though you do not conceive. Burst forth and cry out, though you do not give birth. For many are the children of the desolate, even more than of her who has a husband."
28. Now we, brothers, like Isaac, are sons of the promise.
29. But just as then, he who was born according to the flesh persecuted him who was born according to the Spirit, so also it is now.
30. And what does Scripture say? "Cast out the woman servant and her son. For the son of a servant women shall not be an heir with the son of a free woman."
31. And so, brothers, we are not the sons of the servant woman, but rather of the free woman. And this is the freedom with which Christ has set us free.