Thematic Bible: A spiritual church within it

Not however that God's word has failed; for all who have sprung from Israel do not count as Israel, nor because they are Abraham's true children. But the promise was "Through Isaac shall your posterity be reckoned." In other words, it is not the children by natural descent who count as God's children, but the children made such by the promise are regarded as Abraham's posterity.

God has not cast off His People whom He knew beforehand. Or are you ignorant of what Scripture says in speaking of Elijah--how he pleaded with God against Israel, saying, "Lord, they have put Thy Prophets to death, and have overthrown Thy altars; and, now that I alone remain, they are thirsting for my blood"? But what did God say to him in reply? "I have reserved for Myself 7,000 men who have never bent the knee to Baal." read more.
In the same way also at the present time there has come to be a remnant whom God in His grace has selected. But if it is in His grace that He has selected them, then His choice is no longer determined by human actions. Otherwise grace would be grace no longer. How then does the matter stand? It stands thus. That which Israel are in earnest pursuit of, they have not obtained; but God's chosen servants have obtained it, and the rest have become hardened.