For it is written, "Rejoice, you childless woman, who cannot give birth to any children! Break into song and shout, you who feel no pains of childbirth! For the children of the deserted woman are more numerous than the children of the woman who has a husband."

But what does the Scripture say? "Drive out the slave woman and her son, for the son of the slave woman must never share the inheritance with the son of the free woman."

For it is written that Abraham had two sons, one by a slave woman and the other by a free woman.

Now the slave woman's son was conceived through human means, while the free woman's son was conceived through divine promise.

So then, brothers, we are not children of the slave woman but of the free woman.