I hate these discussions on Perseverance of the Saints/Eteral Security. They always get nasty.
One side often claims that the other wants to sin wantonly as reprobates, which I find personally offensive. The other side often claims the other wants to boast of their salvations, which is not exactly nice either.
This is one of those debates that typically fits Titus 3:8b-9a
“I desire that thou affirm confidently, to the end that they who have believed God may be careful to maintain good |deeds|. These things are good and profitable unto men: but shun foolish questionings, and genealogies, and strifes, and fightings about law; for they are unprofitable” (ASV|NLT 1996, RSV 1952|ASV).
Whether or not one can lose salvation has no REAL bearing on good deeds -- or at least it should not. The debate over the question, however, has caused a great deal of uncharitable language and insinuations contrary to good deeds.
Mman has brought up some good passages discussing some passages that might be discussing a hypothetical loss of salvation. One passage I go to for the contrary is 1 John 2:19, the only Scripture case of people leaving the Christian community: “they were not of us” plus comment “if they had been of us, they would have continued with us” (ASV). However, I cannot answer every passage used by Eternal Security deniers, but at the same time, this passage seems to make Eternal Security appear more plausible than not.
Here is how I see it: if it REALLY matters to a person as far as Christian walk goes, there is a problem. I will address each side in turn.
For those who `depend' on Eternal Security: If you feel no need to obey the Lord because your salvation is `secure,' then you are living a life of insubordination to the Lord and not living according to any belief that Jesus Christ is Lord. Do you REALLY believe that Jesus Christ is Lord? If you do not live like it, you do not.
For those who reject Eternal Security because it `must' mean `license to sin': If you think it takes threat of eternal barbecue to get anyone to obey the Lord, I think such would make me sad. Essentially, you are saying that the prime reason you serve the Lord is for an escape from eternal barbecue. You are in it for yourself. Your prime motivation is not to please the Lord to make Him pleased with what you do for Him.
Really, what difference should it make whether or not we can lose our salvations? We are called to serve the Lord. I believe all servants of Christ ultimately recognize that we need to serve the Lord for the rest of our lives, and we will act accordingly. The question at hand should not matter in practice.
I apologize if I came off `holier-than-thou,' because I am not, but I wondered if that needed said. I will now step off my `soap box.'