27 For it is in the Writings, You who have never given birth, be glad; give cries of joy, you who have had no birth-pains; for the children of her who has been given up by her husband are more than those of the woman who has a husband.

28 Now we, brothers, as Isaac was, are the children of the undertaking of God.

29 But as in those days he who had birth after the flesh was cruel to him who had birth after the Spirit, even so it is now.