Anyway, you may believe that it's not going to happen that someone who once believed in and followed Christ could later turn away later by choice, but I don't believe that scripture teaches that.
By who's choice? There is the new creation, who we are in spirit, and there is the flesh which is already condemned, and remains hostile to God. The new creation spirit would not depart from God. The flesh remains hostile to God.
If we walk in the Spirit, we won't do the works of the flesh. Included such things as "rejecting God", that is clearly a work of the flesh. The flesh is already condemned.
Hebrews 6:4-9:
"For it is impossible in the case of those who have once been enlightened, tasted the heavenly gift, become partakers of the Holy Spirit, tasted the good word of God and the miracles of the coming age, and then have committed apostasy, to renew them again to repentance, since they are crucifying the Son of God for themselves all over again and holding him up to contempt.
For the ground that has soaked up the rain that frequently falls on it and yields useful vegetation for those who tend it receives a blessing from God. But if it produces thorns and thistles, it is useless and about to be cursed; its fate is to be burned. But in your case, dear friends, even though we speak like this, we are convinced of better things relating to salvation.
Notice how
this part is contrasted against
this part?
Personally I prefer the King James, I find it a better translation,
Hebrews 6:4-9 KJV
4) For it is impossible for those who were once enlightened, and have tasted of the heavenly gift, and were made partakers of the Holy Ghost,
5) And have tasted the good word of God, and the powers of the world to come,
6) If they shall fall away, to renew them again unto repentance; seeing they crucify to themselves the Son of God afresh, and put him to an open shame.
7) For the earth which drinketh in the rain that cometh oft upon it, and bringeth forth herbs meet for them by whom it is dressed, receiveth blessing from God:
8) But that which beareth thorns and briers is rejected, and is nigh unto cursing; whose end is to be burned.
9) But, beloved, we are persuaded better things of you, and things that accompany salvation, though we thus speak.
This shows the contrast more clearly, Things that accompany salvation, which are better things, the writer says, than those things said above.
Notice in verses 4 and 5 how the writer gives a list of things, but does not include any reference to rebirth? Or being baptized into Christ? Or being in the body of Christ? None of the ways salvation in the NT is spoken of are used here.
However, everything said can be applied to the Jews who saw Jesus.
For it is impossible for those who were once enlightened,
They heard Jesus, they saw Jesus, the true light, that enlightens every man. But not every man is saved.
and have tasted of the heavenly gift,
They received a taste, being healed, demons cast out, bread and fish multiplied . . .
and were made partakers of the Holy Ghost,
in the simple aorist tense, not like the perfect tense used of those who hold their confidence to the end (Heb 10), Jesus sent out the 12, and then the 70, doing all the same miracles Jesus did by the power of the Holy Spirit.
5) And have tasted the good word of God,
He taught them all the Father commanded
and the powers of the world to come,
lit. the age to come. A glimpse into the future of Israel with Jesus reigns.
At the end of this part, the writer says that he's convinced of better things than what he's written about, things that accompany salvation. The preceding part therefore is not "things that accompany salvation".
So rather than saying a saved person may be permanently unsaved, which conflicts with much Scripture, he's saying that these who saw Him, heard Him, were healed by Him, some of whom even did the same works as Him, these cannot be brought back to repentance.
These are the ones who could commit blasphemy of the Holy Spirit, claiming Jesus' works (which proved His identity) were satanic in origin. All sins would be forgiven men except this one. This one sin, where the rulers of the people blasphemed the Holy Spirit so the people would not believe.
Think about it.
Much love!