I personally don't believe in "once saved always saved" since it goes against so very many scriptures:
Matt.7 [21] "Not every one who says to me, `Lord, Lord,' shall enter the kingdom of heaven, but he who does the will of my Father who is in heaven. [22] On that day many will say to me, `Lord, Lord, did we not prophesy in your name, and cast out demons in your name, and do many mighty works in your name?'
Matt.25 [11] Afterward the other maidens came also, saying, `Lord, lord, open to us.'
Luke.6 [46] "Why do you call me `Lord, Lord,' and not do what I tell you?
1 Corinthians 9:27 but I pommel my body and subdue it, lest after preaching to others I myself should be disqualified.
1 Corinthians 10:12 Therefore let any one who thinks that he stands take heed lest he fall.
Galatians 5:1,4 . . . stand fast therefore, and do not submit again to a yoke of slavery . . . You are severed from Christ, you who would be justified by the law; you have fallen away from grace.
Philippians 3:11-14 that if possible I may attain the resurrection from the dead. ,b>Not that I have already obtained this or am already perfect; but I press on to make it my own, because Christ Jesus has made me his own. Brethren, I do not consider that I have made it my own . . . I press on toward the goal for the prize of the upward call of God in Christ Jesus.
1 Timothy 4:1 Now the Spirit expressly says that in later times some will depart from the faith by giving heed to deceitful spirits and doctrines of demons.
1 Timothy 5:15 For some have already strayed after Satan.
Hebrews 3:12-14 Take care, brethren, lest there be in any of you an evil, unbelieving heart, leading you to fall away from the living God. But exhort one another every day . . . that none of you may be hardened by the deceitfulness of sin. For we share in Christ, if only we hold our first confidence firm to the end.
Hebrews 6:4-6 For it is impossible to restore again to repentance those who have once been enlightened, who have tasted the heavenly gift, and have become partakers of the Holy Spirit, and have tasted the goodness of the word of God, and the powers of the age to come, if they then commit apostasy . . .
2 Peter 2:15,20-21 Forsaking the right way they have gone astray; they have followed the way of Balaam, . . . For if, after they have escaped the defilements of the world through the knowledge of our Lord and Saviour Jesus Christ, they are again entangled in them and overpowered, the last state has become worse for them than the first. For it would have been better for them never to have known the way of righteousness than after knowing it to turn back from the holy commandment delivered to them.