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The "Once Saved" theory would force the conclusion that you can never know IF you really HAD the faith, or if you were fooling yourself all along.

I don't see how that would give anybody the claimed state of assurance.

It's a tautology anyway.

No believer can ever apostatize.
Josh apostatized.
Therefore Josh was never a believer. Not a true believer.
It's the No True Scotsman Fallacy.

It is cognitive dissonance, and sets the letter to the Hebrews aside. It leads to believing one is saved by believing one is saved. The apostolic way of assurance was given by the Apostle Peter

For this very reason, make every effort to supplement your faith with virtue, virtue with knowledge, knowledge with self-control, self-control with endurance, endurance with devotion, devotion with mutual affection, mutual affection with love. If these are yours and increase in abundance, they will keep you from being idle or unfruitful in the knowledge of our Lord Jesus Christ. Anyone who lacks them is blind and shortsighted, forgetful of the cleansing of his past sins. Therefore, brothers, be all the more eager to make your call and election firm, for, in doing so, you will never stumble. For, in this way, entry into the eternal kingdom of our Lord and savior Jesus Christ will be richly provided for you.

Scriptural chapter and verse available by clicking on link

Many scholars, studying the whole of Scripture, recognize that Hebrews warning passages are NOT to believers (”...but I am convinced of better things concerning you, things pertaining to salvation”. Also numerous passages dealing with God’s keeping of the elect (Biblical terminology, not mine) With all respect, 1 John 2:19, Philippians 1:6 and many others deal specifically with the fact that God keeps us and “no one” takes them out of the Father’s Hand (John 6). Todd Friel addresses this well: https://www.youtube.com/watch?v=fl1bQdHfac0 In summation, those who “discover” they aren’t saved are the ones who leave. Biblically, they never were.