The Apostle Paul elaborated in Romans 11:1-11 and 11:25-29: "I say then, Hath God cast away His people? God forbid. For I also am an Israelite, of the seed of Abraham, of the tribe of Benjamin. God hath not cast away His people which He foreknew. Know ye not what the Scripture saith of Elias? How he maketh intercession to God against Israel, saying, Lord, they have killed thy prophets, and digged down thine altars; and I am left alone, and they seek my life. But what saith the answer of God unto him? I have reserved to Myself seven thousand men, who have not bowed the knee to the image of Baal. Even so then at this present time also there is a remnant according to the election of grace. And if by grace, then is it no more of works: otherwise grace is no more grace. But if it be of works, then is it no more grace: otherwise work is no more work. What then? Israel hath not obtained that which he seeketh for; but the election hath obtained it, and the rest were blinded. According as it is written, God hath given them the spirit of slumber, eyes that they should not see, and ears that they should not hear; unto this day. And David saith, Let their table be made a snare, and a trap, and a stumbling block, and a recompence unto them: let their eyes be darkened, that they may not see, and bow down their back always. I say then, Have they stumbled that they should fall? God forbid: but rather through their fall salvation is come unto the Gentiles, for to provoke them to jealousy."
"For I would not, brethren, that ye should be ignorant of this mystery, lest ye should be wise in your own conceits; that blindness in part is happened to Israel, until the fulness of the Gentiles be come in. And so all Israel shall be saved: as it is written, There shall come out of Sion the Deliverer, and shall turn away ungodliness from Jacob: for this is My covenant unto them, when I shall take away their sins. As concerning the Gospel, they are enemies for your sakes: but as touching the election, they are beloved for the fathers' sakes. For the gifts and calling of God are without repentance."
"Jesus saith unto him, I am The Way, The Truth, and The Life;
no man cometh unto the Father but by Me." - John 14:6