(Jud. 1) 2 Mercy to you, and peace, and love, be multiplied. 3 Beloved, when I gave all diligence to write to you of the common salvation, it was needful for me to write to you, and exhort you that you should earnestly contend for the faith which was once delivered to the saints. 4 For there are certain men crept in unawares, who were before of old ordained to this condemnation, ungodly men, turning the grace of our God into lasciviousness, and denying the only Lord God, and our Lord Jesus Christ. 5 I will therefore put you in remembrance, though you once knew this, how that the Lord, having saved the people out of the land of Egypt, afterward destroyed them that believed not. 6 And the angels which kept not their first estate, but left their own habitation, he has reserved in everlasting chains under darkness to the judgment of the great day. 7 Even as Sodom and Gomorrha, and the cities about them in like manner, giving themselves over to fornication, and going after strange flesh, are set forth for an example, suffering the vengeance of eternal fire.
“Common” in verse 3 can be literally translated “shared by all”. Does this mean that everybody will be saved?
What is to be saved, isn’t it preservation of the information in the brain forever? See this sermon for more details. Not knowing how to apply Bible, I will use science: Quantum mechanics teaches (among other) that no information in the universe is ever lost, that is having enough powerful measurement instruments and enough powerful computer one could be always able to reconstruct what was in the past from the future. If nothing is ever lost, then no information from our brain is lost. Does this science mean that everybody is saved?
Not quite. To be saved seems to mean not only not to be lost but to remain alive. The information lived in our brains needs to be preserved alive (continue the live).
The salvation is multiplication of mercy, peace, and love (verse 2). We need (verse 3) to be exhorted about low quality salvation. One may preserve life but live in eternal fire (verse 7).
So what being born again, born from above, and be saved really mean? I confess I don’t really know what it means. I just remind that you can be truly saved only by faith in Jesus Christ.