Can one who is born again be "unborn?"  
It is amazing how many times I've been asked this question, when the Bible is very clear concerning the answer.  The answer is NO, but that is not the end of the answer.  You cannot be unborn, but you can indeed DIE.  The Bible speaks of those who are "twice dead", yet are still living on the earth: 
Jude 1:12 These are spots in your feasts of charity, when they feast with you, feeding themselves without fear: clouds they are without water, carried about of winds; trees whose fruit withereth, without fruit, twice dead, plucked up by the roots; 
This verse is speaking of apostates, who were once dead in sin, then born again, and then turned away from Christ and died spiritually again.  Listen to the warnings in the following verses: 
Romans 6: 16 Know ye not, that to whom ye yield yourselves servants to obey, his servants ye are to whom ye obey; whether of sin unto death, or of obedience unto righteousness? 
17 But God be thanked, that ye were the servants of sin, but ye have obeyed from the heart that form of doctrine which was delivered you.  
18 Being then made free from sin, ye became the servants of righteousness. 
19 I speak after the manner of men because of the infirmity of your flesh: for as ye have yielded your members servants to uncleanness and to iniquity unto iniquity; even so now yield your members servants to righteousness unto holiness. 
20 For when ye were the servants of sin, ye were free from righteousness.  
21 What fruit had ye then in those things whereof ye are now ashamed? for the end of those things is death. 
22 But now being made free from sin, and become servants to God, ye have your fruit unto holiness, and the end everlasting life. 
23 For the wages of sin is death; but the gift of God is eternal life through Jesus Christ our Lord. 
Romans 8:12 Therefore, brethren, we are debtors, not to the flesh, to live after the flesh. 
13 For if ye live after the flesh, ye shall die: but if ye through the Spirit do mortify the deeds of the body, ye shall live. 
When you become an apostate (one who turns away from Christ after believing), you are not the same as the lost person you were before you heard of Christ -- you are worse off than if you had never heard.  Listen close to the following verses: 
2 Peter 2:20 For if after they have escaped the pollutions of the world through the knowledge of the Lord and Saviour Jesus Christ, they are again entangled therein, and overcome, the latter end is worse with them than the beginning. 
21 For it had been better for them not to have known the way of righteousness, than, after they have known it, to turn from the holy commandment delivered unto them. 
Can one who is sealed with the Holy Spirit be "unsealed?" 
Many have tried to defend their unconditional security teaching by saying, "...but the Bible says we are sealed until the day of redemption".  They obviously have not noticed that the verse that says such is a warning to believers not to grieve the Holy Spirit that seals them. 
Ephesians 4:30 And grieve not the holy Spirit of God, whereby ye are sealed unto the day of redemption. 
Most people don't even understand what the seal is.  We are not talking about canned food that is sealed; but the seal of a ruler, which is his "approval".  When Pilate sealed the tomb of Jesus, he showed his approval and authority was behind what they were doing.  The seal was not unbreakable or unconditional.  Listen to what Paul says earlier in the same letter: 
Ephesians 1:13 In whom ye also trusted, after that ye heard the word of truth, the gospel of your salvation: in whom also after that ye believed, ye were sealed with that holy Spirit of promise, 
14 Which is the earnest of our inheritance until the redemption of the purchased possession, unto the praise of his glory. 
The Holy Spirit is given as the seal of God's acceptance of your repentance; and the Holy Spirit comforting us in this way is the earnest of our inheritance -- the "security deposit" which shows that God has accepted our repentance.  Now, if any verse in the Bible teaches that you can lose your inheritance or lose God's favor and acceptance, then it also teaches that the seal of acceptance is conditional and can be broken.  There are many verses that teach the God's acceptance can be lost and is conditioned upon our continual faithfulness and obedience. 
Esau lost his inheritance, and his example is given as a warning to New Testament believers 
Hebrews 12:14 Follow peace with all men, and holiness, without which no man shall see the Lord: 
15 Looking diligently lest any man fail of the grace of God; lest any root of bitterness springing up trouble you, and thereby many be defiled;  
16 Lest there be any fornicator, or profane person, as Esau, who for one morsel of meat sold his birthright
17 For ye know how that afterward, when he would have inherited the blessing, he was rejected: for he found no place of repentance, though he sought it carefully with tears.  
  • We can sell our birthright for a mess of pottage (earthly gain), and when we stand before God, thinking we will be accepted, we will find ourselves rejected -- and no amount of tears or regret will change it. 
    Romans 11:21 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.: 
    King David knew that when he sinned against God, that he was in danger of losing God's Holy Spirit.  In Psalms 51 he cried out: "Take not thy Holy Spirit from me".  God's Spirit is an honored guest, not a prisoner.  If you don't walk in holiness, He doesn't have to stay. 
    2 Cor. 6:16 And what agreement hath the temple of God with idols? for ye are the temple of the living God; as God hath said, I will dwell in them, and walk in them; and I will be their God, and they shall be my people. 
    17 Wherefore come out from among them, and be ye separate, saith the Lord, and touch not the unclean thing; and I will receive you, 
    18 And will be a Father unto you, and ye shall be my sons and daughters, saith the Lord Almighty. 
    7:1 Having therefore these promises, dearly beloved, let us cleanse ourselves from all filthiness of the flesh and spirit, perfecting holiness in the fear of God. 
    God's acceptance is conditional, and the promises are only received if we maintain the conditions faithful until death