This teaching states that once someone has truly believed in Christ with their heart and mind, they can no longer go to hell, no matter what type of sins they may commit thereafter even if they don't repent of them. Some adherents of once saved always saved may argue one could lose rewards but nonetheless never lose salvation because of any sin. Others say if one has truly believed the same will of necessity repent towards the end of ones life. None of these views are traditionally Christian and the following two verses alone completely refutes this idea:
Romans 2:5 But after thy hardness and impenitent heart treasurest up unto thyself wrath against the day of wrath and revelation of the righteous judgment of God; 6 Who will render to every man according to his deeds: 7 To them who by patient continuance in well doing seek for glory and honour and immortality, eternal life: 8 But unto them that are contentious, and do not obey the truth, but obey unrighteousness, indignation and wrath,
Romans 11:20 Well; because of unbelief they were broken off, and thou standest by faith. Be not highminded, but fear: 21 For if God spared not the natural branches, take heed lest he also spare not thee. 22 Behold therefore the goodness and severity of God: on them which fell, severity; but toward thee, goodness, if thou continue in his goodness: otherwise thou also shalt be cut off.
Notice it's the ones who have faith who have been warned that they can be cut off just like the Jews could have and just like the Jews cannot have salvation whilst in a cut off state(they need to be grafted back in) so also the faithful gentiles cannot. Orthodox Christianity teaches that salvation; our journey to attain theosis, is a continuous journey rather than a one-time event. While initial faith and acceptance of Christ are essential, maintaining a faithful and obedient relationship with God is equally vital.
The Orthodox Church emphasises the importance of repentance, confession, and communion with God through the sacraments. Salvation is seen as a transformative process, wherein believers cooperate with God's grace to grow in holiness and become more Christ-like.
The Once Saved, Always Saved doctrine may appear comforting at first glance, offering an assurance of salvation regardless of one's actions or decisions later in life. However, a thorough examination of relevant biblical passages, such as Romans 2:5-8 and Romans 11:20-22, reveals that this teaching is inconsistent with the teachings of Orthodox Christianity.
The church maintains that salvation requires ongoing faithfulness, repentance, and obedience to God, cooperating with His grace to live a holy life. Salvation is not a one-time event but an enduring journey of growing in relationship with God. By understanding and embracing these orthodox teachings, believers can remain rooted in the truth of God's Word and experience the transformative power of His grace throughout their lives.