CLV(i)
26 Yet the Jerusalem above is free, who is mother of us all."
27 For it is written, "Be glad, barren one, who art not bringing forth! Burst forth and implore, thou who art not travailing! For many are the children of the desolate, Rather than of her who has the husband."
28 Now you, brethren, as Isaac, are children of promise."
29 But even as then, the one generated according to flesh persecuted the one according to spirit, thus also it is now."
30 But what is the scripture saying? Cast out this maid and her son, for by no means shall the son of the maid be enjoying the allotment with the son of the free woman."
31 Wherefore, brethren, we are not children of the maid, but of the free woman."