But can you Biblically support and defend your original claim concerning the OP’s question??? So far, you’ve not done so (pruning vines so as to maximize fruit production doesn’t support your claim).
Here’s your original claim:
First problem with your claim
is that’s not even what the guarantee is. The Guarantee IS the Holy Spirit. Paul says so directly. But that’s not even the OP’s question. The question is; What is specifically being guaranteed (by the Holy Spirit)?
Which leads to the second problem with your claim; how long does Paul say we have this Guarantee???
Paul says we have the Guarantee and I quote:
“
until the [final] redemption of His possession”
He even tells us why we have the Guarantee for that long: “
for the praise of His glory.”
See Ephesians 1:14 If you don’t believe we have the Guarantee for that long or for what the Guarantee is.
https://www.biblegateway.com/passage?search=Ephesians 1:14&version=DLNT
Yet your claim is we have the Guarantee merely; “as long as we continue to believe and abide in Christ”.
Third problem with your claim:
Let’s assume we don’t actually have the Guarantee for as long as Paul claims (until the final redemption), for just a moment and go with your claim; How does God losing one of His possessions bring any praise to Him???
Actually the opposite of eternal life is to perish, per Jesus:
And I give them eternal life, and they will never perish, ever. And someone will not snatch them out of My hand.
John 10:28 -
https://www.biblegateway.com/passage?search=John 10:28&version=DLNT