21. Tell me, you who desire to be under the law, have you not read the law?
22. For it is written that Abraham had two sons: one by a servant woman, and one by a free woman.
23. And he who was of the servant was born according to the flesh. But he who was of the free woman was born by the promise.
24. These things are said through an allegory. For these represent the two testaments. Certainly the one, on Mount Sinai, gives birth unto servitude, which is Hagar.
25. For Sinai is a mountain in Arabia, which is related to the Jerusalem of the present time, and it serves with her sons.
26. But that Jerusalem which is above is free; the same is our mother.
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.