If you've read Hebrews at all, you may have found yourself slightly puzzled by some pretty nasty warning passages which seem to imply that a Christian can lose their salvation by not persevering. The starkest of these is probably in Hebrews 10.26-27:
For if we go on sinning deliberately after receiving the knowledge of the truth, there no longer remains a sacrifice for sins, but a fearful expectation of judgment, and a fury of fire that will consume the adversaries. (ESV)
On the face of it we have a fairly unequivocal warning to Christians informing them that a lack of perseverance will lead to an inevitable loss of salvation. This is how the majority of critical New Testament scholars have interpreted these "warnings" in this letter.
Reformed evangelicals have attempted to evade this possibility by suggesting that the people in question are not actually true Christians, but merely confessional ones - in other words, they look like Christians and speak like Christians, but aren't really. There are obvious issues with this interpretation - for example, the language of Hebrews does not seem to describe false Christians.
How do we deal with this then? Andrew Wilson, a Newfrontiers Pastor, has just published an article in Tyndale Bulletin on Hebrews 3.6 and 3.14. Here are the two verses in question:
And we are his house if indeed we ahold fast our confidence and our boasting in our hope. (3.6b ESV)
For we have come to share in Christ, if indeed we hold our original confidence firm to the end. (3.14 ESV)
The question here is perhaps more obvious. Is salvation contingent (directly dependent upon) on perseverance (in which case the author is warning that Christians can lose their salvation) or is perseverance evidence of true salvation (in which case the so-called falling away is a reference to fake Christians). Most commentators have taken one of these lines of interpretation.
In the article Andrew argues that these two verses are speaking of true Christians (in other words not merely apparent Christians). However their perseverance is evidence of their present salvation. In other words, they are already saved and their perseverance will prove this at the eschaton (last day). The author of Hebrews, in Wilson's view, sees their salvation as secure precisely because of these warnings! They will persevere in Christ because he has warned them about falling away. As far as Andrew knows, no recent scholars have suggested this interpretation (both acknowledging that the addressees are real Christians and that the warnings in 3.6 and 3.14 are not conditions, but evidence).
The complete article is here (warning: intense Greek-geeky content). Read the conclusion if you can't battle all the way through, but all in all it was a good read over breakfast!