As one preacher of old stated when asked if he believed in once saved always saved, he replied, yes I believe that with a strong emphasis on once. Many claim that a Christian can commit apostasy but that is not taught in scripture. The 1828 Webster dictionary gives this meaning for apostasy: Apostasy, n. [Gr. a defection, to depart.] An abandonment of what one has professed; a total desertion, or departure from one's faith or religion.So when one understands what Jesus taught about His true disciples then they can see that a true disciple will never do that, John 8:30-32 As He spoke these words, many believed in Him.31 Then Jesus said to those Jews who believed Him, “If you abide in My word, you are My disciples indeed. 32 And you shall know the truth, and the truth shall make you free.” A new creation in Christ is sealed with the Holy Spirit unto the day of redemption, and it is God who places the seal of the Holy Spirit in a person's heart, therefore the true disciples is known by God and only seals those who will abide because it is He who works in the heart of the believer to keep them abiding. Phil 2:13 for it is God working in you to will and to do of His good pleasure and this is to transform every one of His children into the image of His dear Son, Jesus, Rom 8:28-29 And we know that all things work together for good to those who love God, to those who are the called according to His purpose. 29 For whom He foreknew, He also predestined to be conformed to the image of His Son, that He might be the firstborn among many brethren. So I am resting in Christ Jesus and trust Him to fulfill His words, because it is impossible for Him to fail. Ps 37:23-24 The steps of a good man are ordered by the Lord, And He delights in his way.24 Though he fall, he shall not be utterly cast down; For the Lord upholds him with His hand. There are those who have been hanging on for a season, for whatever reason, but He wasn't holding on to them, They went out from us, but they were not of us; for if they had been of us, they would have continued with us; but they went out that they might be made manifest, that none of them were of us. He is always faithful and if He says it will come to pass, it will come to pass.