That is, it is not the children of the flesh who are children of God, but the children of the promise are regarded as descendants. For this is the word of promise: “AT THIS TIME I WILL COME, AND SARAH SHALL HAVE A SON.” And not only this, but there was Rebekah also, when she had conceived twins by one man, our father Isaac; for though the twins were not yet born and had not done anything good or bad, so that God’s purpose according to His choice would stand, not because of works but because of Him who calls, it was said to her, “THE OLDER WILL SERVE THE YOUNGER.” Just as it is written, “JACOB I LOVED, BUT ESAU I HATED.”
What shall we say then? There is no injustice with God, is there? May it never be! For He says to Moses, “I WILL HAVE MERCY ON WHOM I HAVE MERCY, AND I WILL HAVE COMPASSION ON WHOM I HAVE COMPASSION.” So then it does not depend on the man who wills or the man who runs, but on God who has mercy. For the Scripture says to Pharaoh, “FOR THIS VERY PURPOSE I RAISED YOU UP, TO DEMONSTRATE MY POWER IN YOU, AND THAT MY NAME MIGHT BE PROCLAIMED THROUGHOUT THE WHOLE EARTH.” So then He has mercy on whom He desires, and He hardens whom He desires.
You will say to me then, “Why does He still find fault? For who resists His will?” On the contrary, who are you, O man, who answers back to God? The thing molded will not say to the molder, “Why did you make me like this,” will it? Or does not the potter have a right over the clay, to make from the same lump one vessel for honorable use and another for common use? What if God, although willing to demonstrate His wrath and to make His power known, endured with much patience vessels of wrath prepared for destruction? And He did so to make known the riches of His glory upon vessels of mercy, which He prepared beforehand for glory, even us, whom He also called, not from among Jews only, but also from among Gentiles. As He says also in Hosea,
“I WILL CALL THOSE WHO WERE NOT MY PEOPLE, ‘MY PEOPLE,’
AND HER WHO WAS NOT BELOVED, ‘BELOVED.’ ”
“AND IT SHALL BE THAT IN THE PLACE WHERE IT WAS SAID TO THEM, ‘YOU ARE NOT MY PEOPLE,’
THERE THEY SHALL BE CALLED SONS OF THE LIVING GOD.”
Isaiah cries out concerning Israel, “THOUGH THE NUMBER OF THE SONS OF ISRAEL BE LIKE THE SAND OF THE SEA, IT IS THE REMNANT THAT WILL BE SAVED; FOR THE LORD WILL EXECUTE HIS WORD ON THE EARTH, THOROUGHLY AND QUICKLY.” And just as Isaiah foretold,
“UNLESS THE LORD OF SABAOTH HAD LEFT TO US A POSTERITY,
WE WOULD HAVE BECOME LIKE SODOM, AND WOULD HAVE RESEMBLED GOMORRAH.”