The Sda teaches that we are just on a probationary salvation, as we can still forfeit it ...
Indeed, since the scripture does
not teach OSAS. Examples:
1 Sam. 10:1-13, 15:1-31, 16:1-15; 1 Chron. 10:13
OT - King Saul:
Saul was
"turned into another man" (1 Sam. 10:6) and God had given him
"another heart" (1 Sam. 10:9), and it was the LORD (JEHOVAH) that
"anoint[ed]
" (1 Sam. 10:1; 1 Sam. 15:1) him, and
"set [him]
up" (1 Sam. 15:11) and the
"Spirit of God came upon him" (1 Sam. 10:10) and he
"prophesied" (1 Sam. 10:10) among the prophets, for
"God was with [him]
" (1 Sam. 10:7), and the one who
"sent [him]
" (1 Sam. 15:18), for at this time, he
"was little in [his] own sight" (1 Sam. 15:17), for
"the LORD looketh upon the heart" (1 Sam. 16:7) even of Saul, for Saul knew the name of the
"LORD" (1 Sam. 15:13) and
"worshiped" (1 Sam. 15:31) God.
However, though Saul for a while was
"another man", having
"another heart", and the
"Spirit of God", being at that time and for awhile "
little in [his] own sight" (1 Sam. 15:17), he did not continue to follow and obey the voice of the LORD and keep his Law and so "
he is turned back from following [God], and hath not performed [The LORD's] commandments" (1 Sam. 15:11), grieved away the Holy Ghost, and committed the unpardonable sin, and "
the Spirit of the LORD departed from Saul" (1 Sam. 16:14), and later because he refused to turn back (repent) to the LORD, "
Saul died for his transgression which he committed against the LORD, even against the word of the LORD, which he kept not, and also for asking counsel of one that had a familiar spirit, to enquire of it" (1 Chron. 10:13).
Men have the freedom to
"turn back from following" God at any time, even after being given
"another heart".
Deut. 7:4 For they will
turn away thy son from following me, that they may serve other gods: so will the anger of the LORD be kindled against you, and destroy thee suddenly.
Deut. 11:16 Take heed to yourselves, that
your heart be not deceived, and ye turn aside, and serve other gods, and worship them;
This is not only in the OT, but in the NT also:
Acts 4:23-37, 5:1-11.
NT - Ananias and Sapphira:
Ananias and Sapphira were among
"the multitude of them that believed were of one heart and of one soul" (Act. 4:32), and those who were
"assembled together; and they were all filled with the Holy Ghost, and they spake the word of God with boldness" (Act. 4:31). Thy had claimed, as with all the others present, "
ought of the things which he possessed was his own; but they had all things common" (Act. 4:32), and
"and great grace was upon them all" (Act. 4:33). Many of the persons present,
"were possessors of lands or houses sold them, and brought the prices of the things that were sold" (Act. 4:34) and in so doing,
"laid them down at the apostles' feet: and distribution was made unto every man according as he had need" (Act. 4:35). A specific example of this among the believers who acted rightly in honesty, was
"Joses" (Act. 4:36), who,
"Having land, sold it, and brought the money, and laid it at the apostles' feet." (Act. 4:36), and did not attempt to withhold anything, but gave all as promised (having vowed before God and all).
However, we are also given a contrast, of those among
"them that believed" (Act. 4:32), once
"filled with the Holy Ghost" (Act. 4:31), as
"Joses" (Act. 4:36) was, and also made such a vow before
"God" (Act. 5:4) and all, to
"[sell] a possession" (Act. 5:1) and to
"[bring] the prices of the things that were sold" (Act. 4:34), but instead of being faithful in their vow they had made,
"Ananias, with Sapphira his wife" (Act. 5:1) decided to
"[keep] back part of the price" (Act. 5:2) and
"[bring only] a certain part" (Act. 5:2), seeking to hide their deed from the believers, while being noted among the believers as faithful to their vow. They had allowed
"satan" to
"[fill their] heart to lie to the Holy Ghost, and to keep back part of the price of the land" (Act. 5:3), and in so doing, "
not lied unto men, but unto God" (Act. 5:4), even having
"agreed together to tempt the Spirit of the Lord" (Act. 5:9), and thus grieved away the Holy Ghost (allowing satan in), and committed the unpardonable sin against God, and so died in their sin, and
"gave up the ghost" (Act. 5:5,10), and so
"great fear came upon all the church" (Act. 5:11) and all that likewise heard it.
Peter was given information of Ananias and Sapphira's
"hearts" (Act. 5:3,4) by the Holy Ghost (Act. 5:3), even the
"Spirit of the Lord" (Act. 5:9), being
"God" (Act. 5:4), for the Holy Ghost can share portions of His omniscience when needful.
This is a lesson for
"all the church" (Act. 5:11), in that, just because a person at one time in their life
"believed" (Act. 4:32), and was
"filled with the Holy Ghost" (Act. 4:31), does not mean that they cannot of their own free will choose to walk away from God, or to cease from heeding the Holy Ghost, allowing satan in to cause eternal ruin. Sin is very serious.
This is why it is written:
Act. 5:32 And we are his witnesses of these things; and so is also the Holy Ghost, whom God hath given to them that obey him.
Heb. 5:9 And being made perfect, he became the author of eternal salvation unto all them that obey him;
So, as both examples were given
(OT: Saul, 1 Sam. 10:1-13, 15:1-31, 16:1-15; 1 Chron. 10:13, and NT: Ananias and Sapphira, Acts 4:23-37, 5:1-11), we see that a Holy Spirit filled person can of their own choice/decision, turn away from their salvation, and become eternally lost.
John speaks about the sin unto the eternal (second) death. Not physical death. Notice the words,
"I do not say that he shall pray for it" (1 Jhn. 5:16). Why? Because that sin which grieves away the Holy Ghost,
"never hath forgiveness" (Mar. 3:29), which even King David knew, which is why He prayed, after his own sin with Bathsheba and the killing of Uriah,
"Cast me not away from thy presence; and take not thy holy spirit from me." (Psa. 51:11), because David knew to pray,
"Keep back thy servant also from presumptuous sins; let them not have dominion over me: then shall I be upright, and I shall be innocent from the great transgression." (Psa. 19:13), which
"great trasngression" is the unpardonable sin.
1 Jhn. 5:16 If any man see his brother sin a sin which is not unto death,
he shall ask, and he shall give him life for them that sin not unto death.
There is a sin unto death: I do not say that he shall pray for it.
The sin not unto death, are those sins, which are committed before the blaspheming away of the Holy Ghost. However, Ananias and Sapphira had grieved away the Holy Ghost, and as such,
"satan" filled them, as was done in King Saul's case. No one in those places prayed for them, for their forgivenss, for the Holy Ghost already told Peter their hearts. Read it. They are eternally lost.
Christians indeed may commit the unpardonable sin, which is why we are warned and counselled:
Psalms 19:13 KJB - Keep back thy servant also from presumptuous sins; let them not have dominion over me: then shall I be upright, and I shall be innocent from
the great transgression.
We were given an example and ensample [1 Corinthians 10 KJB]:
Psalms 78:40 KJB - How oft did they provoke him in the wilderness, and
grieve him in the desert!
Psalms 78:41 KJB - Yea, they turned back and tempted God, and limited the Holy One of Israel.
They died in the wilderness, through their unbelief, which brought disobedience, and the wages thereof.
The Holy Spirit may indeed be grieved away, and if so, He cannot seal you:
Ephesians 4:30 KJB - And
grieve not
the holy Spirit of God,
whereby ye are sealed unto the day of redemption.
We see another example in the Days of Noah [and thus shall it be in our day, the last generation]:
Genesis 6:3 KJB - And the LORD said,
My spirit shall not always strive with man, for that he also is flesh: yet his days shall be an hundred and twenty years.
Genesis 6:6 KJB - And it repented the LORD that he had made man on the earth, and
it grieved him at his heart.
But who did it start with? The "sons of God" [believers of men] who disobeyed, and followed not after God's commandments. Thus we see the same in the NT, as it was in the days of Noah:
Hebrews 6:4 KJB - 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,
Hebrews 6:5 KJB - And
have tasted the good word of God, and
the powers of the world to come,
Hebrews 6:6 KJB -
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.
Hebrews 6:7 KJB - 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:
Hebrews 6:8 KJB - But that which beareth thorns and briers
is rejected, and is nigh unto cursing;
whose end is to be burned.