Everyone God justifies he glorifies (Rom. 8:29-30). These are those whom God foreknew - in other words, those whom God has predestined to salvation. God saves everyone he intends to save, and it is not possible to be once quickened (into a state of grace) and then fall from grace.
‘For those whom he foreknew he also predestined to be conformed to the image of his Son, in order that he might be the firstborn among many brothers. And those whom he predestined he also called, and those whom he called he also justified, and those whom he justified he also glorified.’
I don’t even need to add anything to the text…
Hebrews 6:1 Therefore let us leave the elementary doctrine of Christ and go on to maturity, not laying again a foundation of repentance from dead works and of faith toward God, 2 with instruction about ablutions, the laying on of hands, the resurrection of the dead, and eternal judgment. 3 And this we will do if God permits. 4 For it is impossible to restore again to repentance
those who have once been enlightened,
who have tasted the heavenly gift,
and have become partakers of the Holy Spirit, 5
and have tasted the goodness of the word of God and the powers of the age to come, 6 if they then commit apostasy, since they crucify the Son of God on their own account and hold him up to contempt. 7 For land which has drunk the rain that often falls upon it, and brings forth vegetation useful to those for whose sake it is cultivated, receives a blessing from God. 8 But if it bears thorns and thistles, it is worthless and near to being cursed; its end is to be burned.
9 Though we speak thus, yet in your case, beloved, we feel sure of better things that belong to salvation.
10 For God is not so unjust as to overlook your work and the love which you showed for his sake in serving the saints, as you still do. 11 And we desire each one of you to show the same earnestness in realizing the full assurance of hope until the end, 12 so that you may not be sluggish, but imitators of those who through faith and patience inherit the promises.
Hebrews 10:26
For if we sin deliberately after receiving the knowledge of the truth, there no longer remains a sacrifice for sins, 27 but a fearful prospect of judgment, and a fury of fire which will consume the adversaries. 28 A man who has violated the law of Moses dies without mercy at the testimony of two or three witnesses.
29 How much worse punishment do you think will be deserved by the man who has spurned the Son of God, and profaned the blood of the covenant by which he was sanctified, and outraged the Spirit of grace? 30 For we know him who said, “Vengeance is mine, I will repay.” And again, “The Lord will judge his people.” 31 It is a fearful thing to fall into the hands of the living God.