Is there something about *has passed (past tense) from death to life* that’s too hard to understand?
Of what about *sealed until the day of redemption*?
Nope.
If salvation is not guaranteed unless a person perseveres, then it’s dependent on their works, not by faith.
It depends upon WHAT they are 'persevering' about.
Every time the chance of losing salvation is mentioned; it is ALWAYS the lack of faith that seals the deal.
It is NEVER lack of works.