Paul shows that the Church isn't like Israel under the Law, "but Jerusalem which is above is free, which is the mother of us all." Galatians 4:26

.............................Then He says that the barren, beareth more than she which hath an husband.

.............................Galatians 4:7
"For it is written, Rejoice, thou barren that bearest not; break forth and cry, thou that travailest not: for the desolate hath many more children than she which hath an husband."