Hebrews 10:10
And by that will we have been sanctified through the offering of the body of Jesus Christ once for all.
Yes, once and for all. In context that means you do not have to make more sacrifices and ordain new priests in this New Covenant. The 'one time, for all time, for all people' Sacrifice and Priest will always be ministering before the altar in heaven for you so that you do not need to come back with another sacrifice for new sins you've committed like you had to under the old covenant.
But so many people think 'once and for all' means there's nothing that can reverse what began when you first believed, oblivious to the fact that what it actually means is you do not need to make additional sacrifices for additional sin. 'Once for all' does not preclude the necessity to
keep believing in the 'One time for all' sacrifice presently ministering in heaven for those who trust in it. And that's not
new, additional believing. It's the continuation of your believing you started the moment you confessed Christ as your savior.
Jn 10:27 — Jn 10:28
My sheep hear my voice, and I know them, and they follow me. I give them eternal life, and they will never perish, and no one will snatch them out of my hand.
Yep, the devil can never take away what you hold fast to through faith in Christ. Only YOU can decide to stop trusting in Christ for the forgiveness of your sin. You don't even need the devil's help to do that, but you do need Christ's help to keep believing. If it were entirely up to you to keep believing you would indeed be lost already. But as it is he is the author and finisher of your faith, not you. Which means He is the power for us to keep believing....if we want to keep believing.
If we're Christ's then we're Christ's. If we're not, then we never were.
Sometimes verses need to be studied with regard to all relevant verses. That way we see Biblical Truths more accurately.
That's exactly right. We MUST consider the entire context of scripture to see that we can indeed lose our salvation if we stop believing.
The promises are for those who BELIEVE. Not for those who don't believe, either because they stopped believing, or because they never believed to begin with. You have eternal life (Jesus Christ) if you believe. If you stop believing you no longer possess the life that is abundant and eternal--Jesus Christ. You are cut out of Christ.
The question of OSAS comes down to a single question: Can believers stop believing? That's the only valid question there is about OSAS, because the Bible makes it abundantly clear what will happen if you do stop believing, so that's not in dispute. Are the warnings to not stop believing sufficient to keep each and every believer believing to the very end as required? IOW, is falling into unbelief only hypothetical? Were the Galatians never really in danger of falling away from justification in Christ, or was it always true all along that all God had to do was warn them not to fall away and they would then not fall away? Answer that question and you have answered the question of OSAS.