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27 For [gar] it is written [grapho], Rejoice [euphraino], thou
barren [steiros] that bearest [tikto] not [ou]; break forth [rhegnumi] and [kai] cry [boao], thou that travailest [odino] not [ou]: for [hoti] the desolate [eremos] hath
many more [polus] children [teknon] than [mallon][e] she which hath [echo] an
husband [aner]. KJV-Interlinear
27 For it
is written, "Rejoice, barren woman who does not bear; Break forth and
shout, you who are not in labor; For more are the children of the desolate Than
of the one who has a husband." NASB
Paul quotes from Isa. 54:1.
Sarah, was the barren woman who had no children for the greater portion of her life. That is until she received the promise from God, through Abraham, that she would have a child, a male child, who would be a blessing for innumerable peoples throughout the ages.
Hagar, was the fertile woman, but she represented the world of works, or the accomplishment of her production from the effort of human plots and plans. As such, she was a slave, functioning as a slave, and producing as a slave, and from that, nothing more could ever or would ever be accomplished.
Any and all production of the world, is temporary at best and will eventually fade from existence. Man cannot create life, but can only perpetuate the temporary. Only God can create life.
Any production resulting from the promise of God, is permanent and will last forever.
Therefore, the offspring of Sarah, are the offspring resulting from the promise, which is a reference to the promised savior, Jesus Christ. And any and all who believe in Christ, are, in effect, the offspring of Sarah through the promise she received from God.
Her blessing in having Isaac, continued the line of Christ, resulting in the first advent and the Cross, and the completion of Gods plan for salvation.
Salvation saves all who believe in Christ. And all who believe in Christ, are the children, or offspring, or result of Gods promise.
No one was ever saved because of the fertility of any woman or all women who ever lived in all of history.
No man gains any credit for siring children. No woman gains any credit by bearing or even nursing children. Salvation is not by procreation, but by Gods promise.
