Selective quoting…
How about these?
22 See then the goodness and the severity of God: towards them indeed that are fallen, the severity; but towards thee, the goodness of God, if thou abide in goodness, otherwise thou also shalt be cut off. 23And they also, if they abide not still in unbelief, shall be graffed in: for God is able to graff them in again.
in expounding on Jesus’ teaching in John 15, Paul teaches that the Jews (the natural branches) were broken off by lack of faith **(v.20 Well; because of unbelief they were broken off, and thou standest by faith. Be not highminded, but fear: ), **
but says that the Romans stand fast through faith (v. 21 : For if God spared not the natural branches, take heed lest he also spare not thee. ). So the Romans are justified.
However, Paul then says that the Romans can also be cut off if they don’t persevere in faith and kindness (v. 22-23: See then the goodness and the severity of God: towards them indeed that are fallen, the severity; but towards thee, the goodness of God, if thou abide in goodness, otherwise thou also shalt be cut off. ). Hence, those justified before God can fall away from the faith and lose their salvation (be “cut off”).
Paul also says that those who are cut off can be grafted back in if they do not persist in their unbelief, for God has the power to graft them in again **(v.23 : And they also, if they abide not still in unbelief, shall be graffed in: for God is able to graff them in again.). **
These verses are devastating to the “once saved, always saved” position.