Two camps exist. Once saved, always saved. Conditional salvation position. Many Scriptures need to be considered. Each camp considers certain Biblical texts. Hebrews 6. Hebrews 10.
The answer lies in considering classical Christianity; which moves beyond mere theology into our experience of knowing the depths of Jesus Christ.
The Classical Christian foundation introduces the way to being possessed by our Lord Jesus and His Presence. There is a place in God where it is almost impossible to fall away from Him where we say as Apostle Paul said, 'Who can separate us from the love of God (manifest Presence of God)?' Divine assurance here is very close to eternal security - once saved, always saved. To be fully established and rooted in this foundation - which is our Lord Himself - we need to pass through the middle stage of the classical Christian journey.
Let us consider this. There is a place in God where we are so possessed by our Lord and His Presence where it is almost impossible to fall away. How does one get to such a place in God? This should be the question that we need to answer.
4 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.
7 For the earth which drinks in the rain that often comes upon it, and bears herbs useful for those by whom it is cultivated, receives blessing from God; 8 but if it bears thorns and briers, it is rejected and near to being cursed, whose end is to be burned.
The New King James Version. 1982 (Heb 6:4–8). Nashville: Thomas Nelson.
26 For if we sin willfully after we have received the knowledge of the truth, there no longer remains a sacrifice for sins, 27 but a certain fearful expectation of judgment, and fiery indignation which will devour the adversaries. 28 Anyone who has rejected Moses’ law dies without mercy on the testimony of two or three witnesses. 29 Of how much worse punishment, do you suppose, will he be thought worthy who has trampled the Son of God underfoot, counted the blood of the covenant by which he was sanctified a common thing, and insulted the Spirit of grace? 30 For we know Him who said, “Vengeance is Mine, I will repay,” says the Lord. And again, “The LORD will judge His people.” 31 It is a fearful thing to fall into the hands of the living God.
32 But recall the former days in which, after you were illuminated, you endured a great struggle with sufferings: 33 partly while you were made a spectacle both by reproaches and tribulations, and partly while you became companions of those who were so treated; 34 for you had compassion on me in my chains, and joyfully accepted the plundering of your goods, knowing that you have a better and an enduring possession for yourselves in heaven. 35 Therefore do not cast away your confidence, which has great reward. 36 For you have need of endurance, so that after you have done the will of God, you may receive the promise:
37 “For yet a little while,
And He who is coming will come and will not tarry.
38 Now the just shall live by faith;
But if anyone draws back,
My soul has no pleasure in him.”
39 But we are not of those who draw back to perdition, but of those who believe to the saving of the soul.
The New King James Version. 1982 (Heb 10:26–39). Nashville: Thomas Nelson.