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Romans 11:17-24, And if some of the branches were broken off, and you, being a wild olive tree, were grafted in among them, and with them became a partaker of the root and fatness of the olive tree, 18 do not boast against the branches. But if you do boast, remember that you do not support the root, but the root supports you.
19 You will say then, “Branches were broken off that I might be grafted in.” 20 Well said. Because of unbelief they were broken off, and you stand by faith. Do not be haughty, but fear. 21 For if God did not spare the natural branches, He may not spare you either. 22 Therefore consider the goodness and severity of God: on those who fell, severity; but toward you, goodness, if you continue in His goodness. Otherwise you also will be cut off. 23 And they also, if they do not continue in unbelief, will be grafted in, for God is able to graft them in again. 24 For if you were cut out of the olive tree which is wild by nature, and were grafted contrary to nature into a cultivated olive tree, how much more will these, who are natural branches, be grafted into their own olive tree? (NKJV)
It seems to me that these verses lay out salvation and how the "eternal security" plays out. Namely, salvation is conditional on your faith/belief. "Because of unbelief they were broken off" Because of their lack of belief, those who were once saved are no longer. And those who are saved are warned to "continue in His goodness" otherwise "you also will be cut off." Also, if we come back to God we can find salvation again "for God is able to graft them in again."
Colossians 1:21-23, And you, who once were alienated and enemies in your mind by wicked works, yet now He has reconciled 22 in the body of His flesh through death, to present you holy, and blameless, and above reproach in His sight— 23 if indeed you continue in the faith, grounded and steadfast, and are not moved away from the hope of the gospel which you heard, which was preached to every creature under heaven, of which I, Paul, became a minister.
Here it seems there is a clear pattern again. Those who were lost, "alienated and enemies", are now saved, "yet now He has reconciled", "holy and blameless", "above reproach in His sight." Only if we continue in the faith and are not moved away.
These verses really hit me hard and convinced me to abandon the "once saved, always saved" view.
Hebrews 3:1, 6, Therefore, holy brethren, partakers of the heavenly calling, consider the Apostle and High Priest of our confession, Christ Jesus... (6) but Christ as a Son over His own house, whose house we are if we hold fast the confidence and the rejoicing of the hope firm to the end.
Here the author of Hebrews seems to be addressing the saved, "holy brethren, partakers of the heavenly calling", and yet seems to view salvation as conditional, "if we hold fast...firm to the end."
Hebrews 3:12-14, Beware, brethren, lest there be in any of you an evil heart of unbelief in departing from the living God; 13 but exhort one another daily, while it is called “Today,” lest any of you be hardened through the deceitfulness of sin. 14 For we have become partakers of Christ if we hold the beginning of our confidence steadfast to the end
Here, the author is still talking to believers, "brethren" and yet still offers numerous warnings about "unbelief" causing "departing from the living God." And that we will become "partakers of Christ if we hold..." Seems to be warning the saved about losing their salvation.
Hebrews 6:4-6, For it is impossible for those who were once enlightened, and have tasted the heavenly gift, and have become partakers of the Holy Spirit, 5 and have tasted the good word of God and the powers of the age to come, 6 if they fall away, to renew them again to repentance, since they crucify again for themselves the Son of God, and put Him to an open shame.
Now, for the sake of discussion I want to focus more on the issue at hand here, namely, eternal security. These verses tend to have a lot of meat in them. It seems, again, those who were saved can fall away.
2 Peter 2:20-21 For if, after they have escaped the pollutions of the world through the knowledge of the Lord and Savior Jesus Christ, they are again entangled in them and overcome, the latter end is worse for them than the beginning. 21 For it would have been better for them not to have known the way of righteousness, than having known it, to turn from the holy commandment delivered to them.
After finding salvation, persons can lose their salvation. And it seems it's worse off for them afterwards
John 15:5-6 I am the vine, you are the branches. He who abides in Me, and I in him, bears much fruit; for without Me you can do nothing. 6 If anyone does not abide in Me, he is cast out as a branch and is withered; and they gather them and throw them into the fire, and they are burned.
This verse could be talking more about faith+works but I don't think that's the whole picture. Those who do not abide in Christ and do not produce fruit are thrown in the fire and burned. Seems fairly severe and could be talking about losing one's salvation.
James 5:19-20 seems to also be talking about eternal security.
So, in short, it seems there is a pattern that is taught in the NT: The lost can become saved-the saved are warned about losing their salvation-the saved can lose their security/salvation.