For if we sin wilfully after that we have received the knowledge of the truth, there remaineth no more a sacrifice for sins, but a certain fearful expectation of judgment, and a fierceness of fire which shall devour the adversaries.
A man that hath set at nought Moses’ law dieth without compassion on the word of two or three witnesses: of how much sorer punishment, think ye, shall he be judged worthy, who hath trodden under foot the Son of God, and hath counted the blood of the covenant wherewith he was sanctified an unholy thing, and hath done despite unto the Spirit of grace?
For we know him that said, Vengeance belongeth unto me, I will recompense. And again, The Lord shall judge his people. It is a fearful thing to fall into the hands of the living God.
But call to remembrance the former days, in which, after ye were enlightened, ye endured a great conflict of sufferings; partly, being made a gazingstock both by reproaches and afflictions; and partly, becoming partakers with them that were so used.
For ye both had compassion on them that were in bonds, and took joyfully the spoiling of your possessions, knowing that ye have for yourselves a better possession and an abiding one.
Cast not away therefore your boldness, which hath great recompense of reward.
For ye have need of patience, that, having done the will of God, ye may receive the promise. For yet a very little while, He that cometh shall come, and shall not tarry.
But my righteous one shall live by faith: And if he shrink back, my soul hath no pleasure in him.
But we are not of them that shrink back unto perdition; but of them that have faith unto the saving of the soul.
Hebrews 10:26-39 ASV
Yet another reference is here to that “boldness” so strongly advocated throughout this epistle. (See under Hebrews 3:6,13.) Christians are repeatedly commanded to maintain by the most vigorous affirmation of it at all times that boldness which they must exhibit under all circumstances, exhorting themselves by constant reference to it, continual glorying in it, and regularly persuading others, especially intimate associates in all walks of life.
But Christ as a son, over his house; whose house we are, if we hold fast our boldness and the glorying of our hope firm unto the end.
Reiterating the supremacy of Christ, the author, on the basis of a bold deduction, names Christians themselves as components of God’s house, “whose house we are”! The old Israel is no more. The Son having been revealed, men are no longer under a servant, even so true and faithful a servant as Moses (Romans 2:28; 9:6-8; Galatians 6:15; John 8:39). Think of the house of God. He laid the foundations of it, even before the world was (1 Corinthians 2:7), provided the blue prints of it in the dispensation of Moses, and extended it upward and outward to include all the families of man in the church of Christ; and, finally, he shall present all to himself in that glorious fulfillment of the everlasting kingdom at the last day (2 Peter 1:11).
If we hold fast our boldness emphasizes the necessity of perseverance in the Christian life, if one is to win the crown. Bruce wrote:
The conditional sentences of this epistle are of special attention (Hebrews 3:14; Hebrews 10:26). Nowhere in the New Testament more than here do we find such repeated insistence of the fact that continuance in the Christian life is the test of reality.
Bruce might have meant by that comment that a failure to continue means there was no reality to begin with, such being the thesis of Calvinism; but continuity must be viewed as a divinely imposed condition of salvation, upon the fulfillment of which destiny depends. Roddy put it squarely thus,
There is no shallow “once saved always saved” here. No superficial being saved and lost, in and out, experience either. But a realization that the evidence of the reality of the grace of God in the life is a constant and living faith regardless of circumstances and inward questions.
The climate for the proper maintenance of faith is not exclusively produced by, nor does it depend solely upon, external conditions. On the other hand, it must be aided by and controlled by the attitude of the believer himself, who has the power to further and strengthen his own faith by a constant, bold, and optimistic proclamation of it. Thomas was aware of this when he wrote:
Weakness is a spiritual peril; and this emphasis on boldness and glorying is a significant reminder that only as we continue courageous and confident can we expect to be firm unto the end. There is an old saying about “whistling to keep up the courage”; and there is no doubt that in things spiritual the secret of courageous and steadfast living is to be bold and to glory constantly in our Christian hope.
Thus there devolves upon the believer himself a frightful responsibility for the preservation and development of his own faith; and this coincides with the fact that faith, rather than being exclusively intellectual, also rests upon and flows out of moral considerations of the highest order (John 3:19).
 F. F. Bruce, The Epistle to the Hebrews (Grand Rapids, Michigan: Wm. B. Eerdmans Publishing Company, 1967), p. 59.
 Clarence S. Roddy, The Epistle to the Hebrews (Grand Rapids, Michigan: Baker Book House, 1962), p. 41.
 W. H. Griffith Thomas, Hebrews (Grand Rapids, Michigan: Wm. B. Eerdmans Publishing Company), p. 41.