Sorry folks, I can't go along with this! I know it's a huge argument but the scripture makes it clear that man can lose his salvation through unbelief, that is, no longer believing in Christ for whatever reason and just walking away from Him.
This is what blasphemy of the Holy Spirit is all about, as we shall see from scripture! The Holy Spirit is humiliated by dwelling in a person who now rejects Christ!
There were some who had accepted Christ as their Saviour but now have gone back to temple worship (Judaism) and renounced Christ. This is what is happening in Hebrews 6.
But before we go there, I would like to say that OSAS came from the Calvinist teaching that the chosen of God cannot resist His grace. They cannot resist receiving it or resist losing it. Therefore they cannot lose their salvation. I intend to prove this is not biblical!
Hebrews 6:4-6
"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,
And have tasted the good word of God, and the powers of the world to come,
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."
As we see here, they were "made partakers of the Holy Spirit" and fell away, in this case, going back to temple worship, thereby rejecting Christ.
They have committed the blasphemy of the Holy Spirit and can never be renewed unto repentance. But the thing is, they will never want to be renewed unto repentance in Christ.
So if you are ever concerned that you may have committed the blasphemy of the Holy Spirit, that is proof you haven't! You will not be concerned of it because you are no longer concerned about Christ.
It is very important to learn how to interpret scripture. Context, is crucial. One important question to start with is: Who is scripture addressing here? The title of the Book is Hebrews. The message preaches about Christ, their Messiah whom they have been waiting for, the Son of God, Who is above the angels, of whose rest they are to enter into (referencing Moses and the Israelites), our High Priest (in relation to the function of the Hebrew High Priest throughout their History).
Specifically it is addressing a mixed crowd if believers and unbelievers. The unelievers who are clinging to the Law and have had doubts about Christ as many in Jerusalem had.
Here is a quote from John MacaArthur about this very passage:
Does Hebrews 6:4-6 teach that a true believer can lose his salvation?
"No. In that passage, the writer of Hebrews is speaking to the unsaved who have heard the truth and acknowledged it, but who have hesitated to embrace Christ. The Holy Spirit warns them, “You had better come to Christ now, for if you fall away it will be impossible for you to come again to the point of repentance.” They were at the best point for repentance–full knowledge. To fall back from that would be fatal."
The Chosen nation were the ones who received the truth from the beginning. They were given the Law and the Prophets, the Truth since Abraham. If they reject Christ now after they have been given ALL, IT WILL BE IMPOSSIBLE FOR THEM TO BE SAVED.
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WE ARE SEALED WITH THE HOLY SPIRIT. Knowing the future and that faith is a gift of God, why would God give this gift to someone He knows would fall away later?
If you are born again from above, it is a done deal.
"For by grace you have been saved through faith, and this not of yourselves; it is a gift, not by works, so that no one can boast."
Eph. 2:8-9
"For I am persuaded, that neither death, nor life, nor angels, nor principalities, nor powers, nor things present, nor things to come, nor height, nor depth, nor any other created thing, shall be able to separate us from the love of God which is in Christ Jesus our Lord."
Romans 8:38-39
No not even you can break that seal.