2 Clement

Rejoice, thou barren that barest not. Break out and cry, thou that travailest not; for more are the children of the desolate than of her that hath the husband. In that He said Rejoice, thou barren that barest not, He spake of us: for our Church was barren, before that children were given unto her.

Εὐφράνθητι, στείρα ἦ οὐ τίκτουσα, ῥῆξον καὶ βόησον, ἡ οὐκ ὠδίνουσα, ὅτι πολλὰ τὰ τέκνα τῆς ἐρήμου μᾶλλον ἢ τῆς ἐχούσης τὸν ἄνδρα. ὃ εἶπεν: Εὐφράνθητι, στεῖρα ἡ οὐ τίκτουσα, ἡμᾶς εἶπεν: στεῖρα γὰρ ἦν ἡ ἐκκλησία ἡμῶν πρὸ τοῦ δοθῆναι αὐτῇ τέκνα.

And in that He said, Cry aloud, thou that travailest not, He meaneth this; Let us not, like women in travail, grow weary of offering up our prayers with simplicity to God.