“Moreover, whom he did predestinate, them he also called, and whom he called, them he also justified, and whom he justified, them he also glorified.” (Romans 8:30)
Between eternity past in God’s predestination, and eternity future in God’s glorification, none is lost.
No one who is predestined in the foreknowledge of God for sonship fails to be called. And no one who is called fails to be justified. And no one who is justified fails to be glorified. This is an unbreakable steel chain of His divine covenant faithfulness. He is always faithful to His Word. He cannot lie or fail to carry out His promises.
And so Paul says,
“Being confident of this very thing, that He who hath began a good work in you will perform it until the day of Jesus Christ.” (Philippians 1:6)
“…Our Lord Jesus Christ, who shall also confirm you unto the end, that ye may be blameless in the day of our Lord Jesus Christ. God is faithful, by whom ye were called unto the fellowship of His Son, Jesus Christ our Lord.” (1 Corinthians 1:8–9)
These are the promises of our God who cannot lie. Those who are born again believers in Jesus Christ are as secure as God is faithful.