@FirstLovedByHim
Here maybe this will help you understand since you do affirm context is important
To understand Hebrews need to remember the audience.
He was writing to HEBREW believers.
They were Jewish Christians NOT gentiles.
All the warnings in the book of Hebrews were written to tell them to stop leaving the finished work of Christ to go back to their own works righteousness and animal sacrifices. They were professing Christians but they kept going back and offering sacrifices at the temple.
This is the 'falling away" the author was writing about.
None of these warnings were supposed to instill fear about our salvation, they were meant to clarify that we live by FAITH in the FINISHED work of Christ and to stop going back to the old way of living by the law and animal sacrifices!
V1-3: "Therefore,
leaving the discussion of the elementary principles of Christ, let us go on to perfection,
not laying again the foundation of repentance from dead works and of faith toward God, of the doctrine of baptisms, of laying on of hands, of resurrection of the dead, and of eternal judgment. And this we will do if God permits"
After this comes verse 4: "
For it is impossible..." (the "for" being a conclusion)
Connection here between elementary principles, the going on and on again about the foundation of repentance...... and then it goes on to confirm
an elementary principle - the impossibility of being saved, unsaved, then saved again (impossible to be renewed again when already renewed) - this is elementary!!