You know, I said "We only know that we can be, and hope that we will be," and 1 Peter 1:3 seconds that
Not assurance, but "living hope."
But, then, again, there are at leats a dozen different "salvational formulas" in the NT. Every Christian group will find one that suits their particular belief.
John was written at the end of the century. It is curious that the other three Gospels make no mention of this. After all, it is a such a powerful statement, that surely everyone whould have remembered it. However, that's not the case.
But, if God is life, then it doesn't matter what you theology is; what matters is how Christ-like you are.
It always goes back to works and uncertainty for the EO doesn't it.