The Bible does not speak as if one cannot fall away—no one simply reading it would ever come to that conclusion.
It's a doctrine motivated and driven by a wrong fear of losing salvation, a lack of trust in God.
Every promise that is "used" to prove this, it is assumed that the promise has no conditions.
Therefore the LORD God of Israel says: `I said indeed that your house and the house of your father would walk before Me forever.'
But now the LORD says: `Far be it from Me; for those who honor Me I will honor, and those who despise Me shall be lightly esteemed. (1 Sam. 2:30 NKJ)
Now according to their whole line of argument, once God promises something, nothing else could ever happen.
Consider the same logic rephrased for other proof texts:
Therefore the LORD God of Israel says: `I said indeed that no one can take my sheep out of my hand.'
But now the LORD says: `Far be it from Me; for those who honor Me I will honor, and those who despise Me shall be lightly esteemed.
Therefore the LORD God of Israel says: `I said indeed that nothing can separate you from the love of Christ.'
But now the LORD says: `Far be it from Me; for those who honor Me I will honor, and those who despise Me shall be lightly esteemed.
It's the exact same logic and principle.
I understand some people live in fear (which does not logically follow), that people have beat up and over-sensitive consciences, and we want to encourage those people that they did not commit the unpardonable sin.
But on the other hand, many people will wake up in hell because of this wicked doctrine of eternal security.
In Johns writing we read the following regarding Jesus. He was in the beginning with God(John 1:1,1 John 1:1-4) We also read that
in Him was life, the very source of life (John 1:4)whoever believes
in Him shall not perish, but have eternal life(3:16) He who believes
in the Son has eternal life(3:36) He who eats My flesh and drinks
My blood has eternal life, and I will raise him up on the last day(6:54)This is eternal life, that they may know You, the only true God,
and Jesus Christ whom You have sent(17:3)These things I have written to you who believe in the name of
the Son of God, so that
you may know that you have eternal life(1 John 5:13).
Jesus is in fact Eternal Life. He who has the Son has the life and he who does not have the Son does not have the life. He is the true God and Eternal Life(1 John 1:1-4,5:20).
Eternal life is not just unending life. It is the life we now have in God through Jesus. John refers to Jesus Christ Himself as eternal life. It is life that comes from God. A person who has eternal life has God’s life within him.
It is obvious that eternal life doesn’t begin when we die. Jesus said, He who believes in Me has (present tense) everlasting life. He didn’t say that the one who believes in Him will have (future tense) everlasting life. He said that he has eternal life in the here and now from that very first moment of faith. Eternal life is unending life.
Jesus, Paul and John emphasize that eternal life is a present reality and the present possession of the Christian in the here and now. It will have its ultimate fulfillment in the future but every believer has eternal life at the moment they believe in the Son of God.
Jesus said I give them eternal life, and they shall never perish; no one can snatch them out of my hand. (John 10:28).That means nothing or no one can remove a believer from Christ.
Paul tells us in Ephesians 4:30 that believers are sealed for the day of redemption. If believers did not have salvation or eternal life/security then the sealing could not truly be until the day of redemption. Paul in Romans 8:38-39 really drives home the everlasting promise of eternal life/salvation for the believer "For I am convinced that neither death nor life, neither angels nor demons, neither the present nor the future, nor any powers, neither height nor depth, nor anything else in all creation, will be able to separate us from the love of God that is in Christ Jesus our Lord." Our eternal security is bought with the blood of Christ, promised to us by the Father Who cannot deny Himself and sealed in the believers heart by the Holy Spirit. What wonderful promises believers have for their eternal security in Christ.
Jesus tells us in John 3:15-16 that whoever believes in Jesus Christ will have eternal life, not might have but actually possesses that everlasting life. If a person is promised eternal life and then to have it taken away then it was never eternal to begin with and it makes Jesus out to be a liar and the promises of God to be false. Below we see more promises the believer can count on for eternal life now and in the future. We can be confident in the promises of God.
John 3:16
16 "For God so loved the world, that He gave His only begotten Son, that whoever believes in Him shall not perish,
but have eternal life.
John 3:36
"He who believes in the Son
has eternal life;
John 5:24
"Truly, truly, I say to you, he who hears My word, and believes Him who sent Me,
has eternal life, and does not come into judgment, but has passed out of death into life.
John 6:47
"Truly, truly, I say to you, he who believes
has eternal life.
John 6:54
54 "He who eats My flesh and drinks My blood
has eternal life, and I will raise him up on the last day.
John 10:27-30
"My sheep hear My voice, and I know them, and they follow Me; 28 and
I give eternal life to them,
and they will never perish; and no one will snatch them out of My hand. 29 "My Father, who has given them to Me, is greater than all; and no one is able to snatch them out of the Father's hand. 30 "I and the Father are one."
Matt 25:46
"These will go away into eternal punishment, but the righteous into eternal life."
1 John 3:14
We know that we have passed out of death into life,
1 John 5:13
These things I have written to you who believe in the name of the Son of God, so that
you may know that you have eternal life.
Romans 8
And we know that in all things God works for the good of those who love him, who[
i] have been called according to his purpose. 29 For those God foreknew he also predestined to be conformed to the image of his Son, that he might be the firstborn among many brothers and sisters. 30 And those he predestined, he also called; those he called, he also justified; those he justified, he also glorified.
31 What, then, shall we say in response to these things? If God is for us, who can be against us? 32 He who did not spare his own Son, but gave him up for us all—how will he not also, along with him, graciously give us all things? 33 Who will bring any charge against those whom God has chosen? It is God who justifies. 34 Who then is the one who condemns? No one. Christ Jesus who died—more than that, who was raised to life—is at the right hand of God and is also interceding for us. 35 Who shall separate us from the love of Christ? Shall trouble or hardship or persecution or famine or nakedness or danger or sword? 36 As it is written:
“For your sake we face death all day long;
we are considered as sheep to be slaughtered.”
37 No, in all these things we are more than conquerors through him who loved us. 38
For I am convinced that neither death nor life, neither angels nor demons, neither the present nor the future, nor any powers, 39 neither height nor depth, nor
anything else in all creation, will be able to separate us from the love of God that is in Christ Jesus our Lord.
conclusion: those having eternal life can never be separated from Christ. As Jesus said no one can snatch one from His hands whom He has given eternal life.
hope this helps !!!