[ScubieNuc]

I agree with you. We just can’t know. Only God knows who’s saved.

Really? Then why did John write this:

1John 5:13 These things have I written unto you that believe on the name of the Son of God; that ye may know that ye have eternal life, and that ye may believe on the name of the Son of God.

Wasn’t it St. Paul who said he worked on his salvation every day- in fear and trembling? He obviously knew he belonged to Christ but that salvation could be lost.

Not quite the right understanding of the verse. The verse you are thinking of is Philipians 2:12, but to understand it you need to look at it's context.

The context is people claiming to have Christ in them, so Paul is telling them to show that on the outside. The word that gets translated "work out" is katergazomai which basically means to show or demonstrate. It doesn't mean what people think of today. Like if my son says that his fishing line is tangled and I say "work it out yourself".

One other aspect of this is that if you believe Paul is saying that a person is saved through their works, then he is contradicting himself from what he wrote to others, like in Ephesians:

Eph. 2:8-9 For by grace are ye saved through faith; and that not of yourselves: [it is] the gift of God: Not of works, lest any man should boast.

[Melian]

The Letters of the Apostles are rife with passages indicating that one must live Christ’s words, not just talk about them.

If mere belief was enough for salvation, why would Paul write to various groups of converts cautioning them that they were on the wrong track? Weren’t they “saved” by virtue of being Christians? No. He wrote because they were in jeopardy of losing their salvation by improper beliefs, misunderstandings, and impure acts.

In other words, their actions were not in keeping with belonging to Christ. Paul seemed to think that was pretty serious!