Clement of Rome (attributed)

"Rejoice, you barren that bearest not; break forth and cry, you that travailest not; for she that is desolate has many more children than she that has an husband." In that He said, "Rejoice, you barren that bearest not," He referred to us, for our church was barren before that children were given to her. But when He said, "Cry out, you that travailest not," He means this, that we should sincerely offer up our prayers to God, and should not, like women in travail, show signs of weakness. And in that He said, "For she that is desolate has many more children than she that has an husband," [He means] that our people seemed to be outcast from God, but now, through believing, have become more numerous than those who are reckoned to possess God.