Well, scripture says that we are sealed with the Holy Spirit until some event. That indicates that we could possibly become unsealed at that event.
Ok, so let's see what scripture REALLY says, shall we:
Ephesians 1:13 In whom ye also trusted, after that ye heard the word of truth, the gospel of your salvation: in whom also
after that ye believed, ye were sealed with that holy Spirit of promise,
Notice that this speaks of PAST tense, not future. Paul said that they WERE (past tense) sealed.
That context then goes on to say:
Ephesians 1:14 Which
is the
earnest of our inheritance
until the redemption of the purchased possession, unto the praise of his glory.
The seal is the EARNEST, which IS (see that), not will be, but IS the earnest. There's no mystery in the fact that we are still living in these sinful bodies of flesh, and therefore are not completely redeemed from this body of sin, but our soul is indeed saved with our having become a new creation.
Where do you see that as allegedly being something future? The seal is itself the earnest. We don't possess our rewards here in this life, they are yet to be possessed once we are where they are stored.
Please show where any one verse or context states ant potential for unsealing. I'd really like to see it, because it appears you're eisegetically reading that into the text what seems to not be there at all.
MM