I would like to go back to a point in rom 11:
19Thou wilt say then, The branches were broken off, that I might be grafted in.
20Well; because of unbelief they were broken off, and thou standest by faith. Be not highminded, but fear:
Well because of unbelief they were broken off, that is, the natural branches that belonged to covenant Israel, Now even though unbelief is reprehensible, it nevertheless is determined solely by the Sovereignty of God, that is what determines who shall believe God and His word, and who shall not believe. Because of the Fall, when satan was able to deceive eve into unbelief of what God had said, God said if thou eat, thou shalt surely die, and satan said, thou shalt not surely die [Gen 3:3-4], because of this man was judged by God as a unbeliever, we were concluded or consigned under unbelief..
rom 11:
32For God hath concluded them all in unbelief, that he might have mercy upon all.
The word concluded in the greek means:
to shut up together, enclose
of a shoal of fishes in a net
to shut up on all sides, shut up completely
We are by nature shut up in unbelief, completely enclosed by it. God has hopelessly shut up all into unbelief or disobedience, by nature.
Now why does man think he has a freewill choice to reverse this and become obedient or a believer in Christ ? Proud man believes he can undo what God has done ! but lets look at ecc 7:
13Consider the work of God: for who can make that straight, which he hath made crooked?
rev 3:
7And to the angel of the church in Philadelphia write; These things saith he that is holy, he that is true, he that hath the key of David, he that openeth, and no man shutteth; and shutteth, and no man openeth;
It has to be given [ not offered] from heaven to believe on Christ and or the the things of God; it is not something that comes naturally see 1 cor 2:14 & phil 1:29
Paul tells the gentiles, be not high minded, but rather fear, because ye stand by Faith, and Faith is not our own. This verse if properly understood, should give us to know that Faith is not of man, or why would Paul make such a statement as this ? It is because standing by Faith is nothing less than standing by the power of God 1 pet 1:5, for faith in us is maintained by God's power. Remember when Jesus told peter Lk 22:32
But I have prayed for thee, that thy faith fail not: and when thou art converted, strengthen thy brethren.
I infer from this that Jesus prayed for Peter's faith to be kept by the power of God, which incident peter probably had in mind when He penned 1 pet 1 5. Faith is God given and God sustained. Notice rom 14:
Who art thou that judgest another man's servant? to his own master he standeth or falleth. Yea, he shall be holden up: for God is able to make him stand.
For clearly, its God who causes one by His power to stand by Faith; so the gentiles must not boast against the jews who have been broken off, if so, then we are actually by implication saying that we are the ones responsible for our being grafted in, and not the root that bore us, which is Christ; It is because of our election in Christ, our Head, that He communicates o us His life, and His Faith, that is the faith of the Son of God gal 2:
20I am crucified with Christ: nevertheless I live; yet not I, but Christ liveth in me: and the life which I now live in the flesh I live by the faith of the Son of God, who loved me, and gave himself for me.