People who don’t think a genuine believer
in Jesus Christ belongs irrevocably to him use a variety of verses to support their claim that it is possible to be saved and then lose
your salvation.
This isn’t a verse I’m used to seeing used
that way:
“Therefore, brothers, be all the more diligent to confirm your calling and election, for if you practice these qualities you will never fall.”
The usual suspects are full of catchy
expressions like “eternal sin”, “sin that leads to death” or even “impossible to restore them again to repentance”. Separate such phrases from their contexts and
it is possible to become quite confused and concerned about the permanence of salvation.