For it is written,
Rejoice, you barren that bear not; break forth and cry, you that travail not: for the desolate has many more children than she who has a husband.
All Commentaries on Galatians 4:27 Go To Galatians 4
John Chrysostom
AD 407
Who is this who before was barren, and desolate? Clearly it is the Church of the Gentiles, that was before deprived of the knowledge of God? Who, she which has the husband? plainly the Synagogue. Yet the barren woman surpassed her in the number of her children, for the other embraces one nation, but the children of the Church have filled the country of the Greeks and of the Barbarians, the earth and sea, the whole habitable world. Observe how Sarah by acts, and the Prophet by words, have described the events about to befal us. Observe too, that he whom Isaiah called barren, Paul has proved to have many children, which also happened typically in the case of Sarah. For she too, although barren, became the mother of a numerous progeny. This however does not suffice Paul, but he carefully follows out the mode whereby the barren woman became a mother, that in this particular likewise the type might harmonize with the truth.