God did not reject his people, whom he foreknew. Don’t you know what Scripture says in the passage about Elijah—how he appealed to God against Israel:
“Lord, they have killed your prophets and torn down your altars; I am the only one left, and they are trying to kill me” ?
And what was God’s answer to him? “I have reserved for myself seven thousand who have not bowed the knee to Baal.”
So too, at the present time there is a remnant chosen by grace.