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
The church was not only barren like Sarah and did not only become rich in children like her, but it also gave birth in the same way as Sarah. For just as it was not nature but the word of God that made her a mother … so too in our own regeneration it is not nature of any kind but the word of God spoken through the presbyter, as the faithful know, in the waters of the font, as in a womb, that fashions and regenerates the one who is being baptized.