Position One: True Christians Do Apostatize
The first of these possibilities is the least attractive. Though the language in Hebrew 6:4-8 is very vivid and concrete, especially in the NASB translation, it is not clear that the author had in mind any of his readers. The author of Hebrews repeatedly gave stern warnings coupled with assurance that his readers had not already fallen. For example, after the extended warning of falling into unbelief and failing to enter God's rest in chapters 3 & 4, the author concludes: "Let us therefore be diligent to enter that rest, lest anyone fall through following the same example of disobedience" (Hebrews 4:11). The warning was to motivate, not condemn. Likewise our warning passage in Hebrews 6 is followed by this assessment of the readers' own condition: "But, beloved, we are convinced of better things concerning you, and things that accompany salvation, though we are speaking in this way" (Hebrews 6:9). The warning in Hebrews 10:26f is just as severe but is followed by these comforting words: "But we are not of those who shrink back to destruction, but of those who have faith to the preserving of the soul" (Hebrews 10:39). "We" here is the Christian community, the author included. It is clear that the writer of Hebrews did believe in persevering faith. He evidently believed the Holy Spirit's warnings would be effectual.
Position Two: Apostates Were Never Truly Regenerate
The second possibility has more to commend it and a number of Biblical commentators have adopted it.19 The strength of the view (that these were people who were part of the community of faith but not truly elect) is that the Biblical examples of apostates fall into this category. The clearest New Testament example is Judas. Judas had all of the privileges of the other disciples, had gone out with them and healed the sick and cast out demons, and had shared their many experiences in learning at the feet of the Master. Yet Judas had a demon and died in his own miserable sin. He fits into the category of people of which our Lord warns: "Many will say to Me on that day, Lord, Lord, did we not prophesy in Your name, and in Your name cast out demons, and in Your name perform many miracles?' And then I will declare to them, I never knew you; depart from Me, you who practice lawlessness'" (Matthew 7:22,23). These had indications of involvement with the powerful work of the Holy Spirit, yet Christ said He never knew them.
Another New Testament example is Simon Magus of Acts 8. John wrote about false teachers: "They went out from us, but they were not really of us; for if they had been of us, they would have remained with us; but they went out, in order that it might be shown that they all are not of us" (1John 2:19). This is further evidence of a class of "Christians" who had shared experiences with the larger community but were not truly regenerate. Their leaving was what ultimately showed their true condition. Furthermore, the parable of the sower and seeds (Luke 8:11-18) predicts a variety of responses to the word of God including joyful reception that eventually gives way to falling away (verse 13).
More evidence for this view is found in the Old Testament citations and allusions throughout Hebrews. The whole of Israel was the community of faith that departed from Egypt, wandered through the wilderness, and given hope of the promised land. The community as a whole consisted both of people with faith (Hebrews 11) and those who died in unbelief (Hebrews 3:19). In Romans 9, Paul distinguishes between those of Israel who were merely "children of the flesh" and those who were children of promise. Esau is an example of a fleshly child and the author of Hebrews uses him as an example of one who was unable to gain repentance (Hebrews 12:17). Similarly, 1Corinthians 10 uses the community of Israel who were all "baptized" in the cloud and the sea (verses 1-4; symbolizing baptism in the Spirit and water), yet some fell into idolatry and perished as an example and warning to the church. Sharing the experiences of the larger community and then turning from Christ to idols would result in the same tragic consequences as it did for those following Moses.
Since the visible church consists of all those who profess faith in Christ, but the invisible church consists of only those who are truly God's elect, the church always has in her midst individuals who are like Judas among the twelve. Those who hold the second view about apostasy believe that apostates always come from this category of people. In as much as they are fully participating in the community of faith, it can be said that they were enlightened, tasted the heavenly gift, been made partakers of the Holy Spirit, and tasted of the powers of the world to come. Their falling away seals their damnation and serves as a warning to the rest of the flock. However, they were never truly regenerate and a part of God's elect.
Position Three: The Warning Is Always Effectual
The third option is intriguing. The warning against apostasy is the means God uses to keep His people from apostasy. What is appealing about this is that it takes the language of the text with utmost seriousness and applies it to all Christians as the author of Hebrews intended. The four participles that describe the experience of those who are warned clearly describes Christian experience. There is no reason that anyone should read these verses and think, "I am one of the elect, this does not apply to me." The more one has experienced the work of the Holy Spirit in his or her life the more sober the warning. Those who have been given much are more accountable for what they have (Luke 12:48). Therefore, the sober warning applies to true Christians.
A strong proponent of this view was Albert Barnes. He wrote, "The knowledge that apostasy would be fatal, and there could be no hope of being saved should it once occur would be a more effectual preventive of the danger than all the other means that could be used. . . . It may be added, that the means used by God to preserve his people from apostasy, have been entirely effective."20 Barnes did not believe that any true Christian ever has committed or will commit apostasy.21 God's means of keeping His elect from apostasy are many, not the least of which is the warning itself.
Some will find this position unappealing because they assume that if none of the truly regenerate will fall away, then the warning is of no real consequence. If apostasy is an impossibility, then it is meaningless and mute. However, one can make a legitimate distinction between an impossibility and what I call an unactualized theoretical possibility. Hebrews does not call apostasy impossible. What is impossible is to renew to repentance one who has committed apostasy. The idea of renouncing one's faith, denying Christ, and living a life of unmitigated sin is surely within the realm of things humanly possible. That some outward professors like Judas have already done this lends even more credibility to potential, eternal danger.
Yet if we have assurance of salvation and evidence in our lives of truly being children of God, surely it is true that we will not apostatize. But if we were to do so we can be sure that we would be facing eternal damnation with no hope of repentance. It is legitimate to introduce the possibility of something that will not happen to motivate one to avoid it. We regularly warn children about things they hopefully never do. For example we tell them that if they play on a busy freeway they will be killed. If this never happens, the warning is still valid. As long as the danger is something within the realm of things possible for humans in the world as we know it, the warning has motivational currency.
For example, consider the possibility of all life on earth being annihilated by a nuclear holocaust. Humankind has the means, we are told, to do this. Though it has never happened and many never happen, it is real enough to motivate us to avoid it. The Bible teaches that God Himself will judge the earth, so we can be assured He is not going to allow us to destroy ourselves entirely before He causes all the prophecies in the Bible to be fulfilled. Yet we would be fools not to take the nuclear threat seriously. An impossibility is different. It is something that cannot be because of the nature of things. We cannot sprout wings and fly to the moon and we cannot turn lead into gold. Known impossibilities create neither fear nor hope, they are the stuff of fantasy or irrationality. Apostasy fits into the former category. It is something that could be, but for the elect will not be. Thus it is an unactualized theoretical possibility, not an impossibility. Its possibility is as real as a nuclear holocaust.
Conclusion
Positions two and three outlined above are not mutually exclusive. It is true that people who have been a part of the visible church commit apostasy. In their case, they left us because they were not really of us, John 2:19. That God has allowed this is part of His means of warning His people. Jesus knew who Judas was and what he would do, but brought him into the twelve. The story of his wickedness has served as a warning to all who have read the gospel account. This goes for Balaam, Saul, Esau, Korah, Hymenaeus, Alexander (1Timothy 1:19,20) and all others who have likewise made shipwreck of the faith. These appeared to fit the category described by the four participles of Hebrews 6:4,5 but it turned out that they did not fully experience electing grace.
It is also true that the warning against apostasy is given to the whole visible church. It is real and has motivational currency for the truly regenerate. The warning is so powerful that it is effectual and none of those the Father has given the Son will perish. They heed the warning and flee to the grace of God which enables His people to live an overcoming life. They know that if they did blaspheme the Holy Spirit by insulting Him and recrucifying Christ, putting Him to open shame, they would be irredeemably damned. This fearful, sobering reality drives God's people back into His loving arms. This, I believe, was why the writer of Hebrews was convinced that his readers had "faith to the preserving of the soul" (Hebrews 10:39).