This truth is pointed out by Paul in Romans 11:28-36
28 As regards the gospel, they are enemies of God for your sake. But as regards election, they are beloved for the sake of their forefathers. 29For the gifts and the calling of God are irrevocable. 30For just as you were at one time disobedient to God but now have received mercy because of their disobedience, 31so they too have now been disobedient in order that by the mercy shown to you they also may now receive mercy. 32For God has consigned all to disobedience, that he may have mercy on all.
33Oh, the depth of the riches and wisdom and knowledge of God! How unsearchable are his judgments and how inscrutable his ways!
34"For who has known the mind of the Lord,
or who has been his counselor?"
35"Or who has given a gift to him
that he might be repaid?"
36For from him and through him and to him are all things. To him be glory forever. Amen.
Romans 11:
25 I do not want you to be ignorant of this mystery, brothers and sisters, so that you may not be conceited: Israel has experienced a hardening in part until the full number of the Gentiles has come in, 26 and in this way[Or and so] all Israel will be saved. As it is written:
“The deliverer will come from Zion;
he will turn godlessness away from Jacob.
27 And this is[Or will be] my covenant with them
when I take away their sins.”[Isaiah 59:20,21; 27:9 (see Septuagint); Jer. 31:33,34]
I love the verses you gave, they are beautiful, in the right perspective, not in a perspective of the peddle picking God, I love them, I love them not ;Belief.
The full amount of Israel is the sands of the seashore. Praise God. The verses before that shows who the elect are.
Romans 11:
17 If some of the branches have been broken off, and you, though a wild olive shoot, have been grafted in among the others and now share in the nourishing sap from the olive root, 18 do not consider yourself to be superior to those other branches. If you do, consider this: You do not support the root, but the root supports you. 19 You will say then, “Branches were broken off so that I could be grafted in.” 20 Granted. But they were broken off because of unbelief, and you stand by faith. Do not be arrogant, but tremble. 21 For if God did not spare the natural branches, he will not spare you either.
22 Consider therefore the kindness and sternness of God: sternness to those who fell, but kindness to you, provided that you continue in his kindness. Otherwise, you also will be cut off. 23 And if they do not persist in unbelief, they will be grafted in, for God is able to graft them in again. 24 After all, if you were cut out of an olive tree that is wild by nature, and contrary to nature were grafted into a cultivated olive tree, how much more readily will these, the natural branches, be grafted into their own olive tree!
See Israel was to enter into salvation, but did not because of unbelief, cut out, but God kept these.
Zephaniah 3:12
But I will leave within you the meek and humble. The remnant of Israel will trust in the name of the LORD.
Then He included Gentiles, when they heard the Gospel of their salvation having believe.
If men can be cut out for unbelief and included for belief. That the elect is Believers the meek and humble who trust in the Lord, who followed their for-fathers like Abraham, they believe God and was credited righteousness.
People want to believe they are randomly picked elected before the foundation, I see believers who trust in the Lord. God has them written in the Lambs book of life because He knows who they are or He wouldn't be God.
Those who trust in the Lord, this call and those who come is irrevocable. When you trust in the Lord, it is Him that saves you.
All men are in disobedience to the Law even the Jews who the Law was given to, so God can show mercy to all who trust in His Son.