10:26-31 The exhortations against apostacy and to perseverance, are urged by many strong reasons. The sin here mentioned is a total and final falling away, when men, with a full and fixed will and resolution, despise and reject Christ, the only Saviour; despise and resist the Spirit, the only Sanctifier; and despise and renounce the gospel, the only way of salvation, and the words of eternal life. Of this destruction God gives some notorious sinners, while on earth, a fearful foreboding in their consciences, with despair of being able to endure or to escape it. But what punishment can be sorer than to die without mercy? We answer, to die by mercy, by the mercy and grace which they have despised. How dreadful is the case, when not only the justice of God, but his abused grace and mercy call for vengeance! All this does not in the least mean that any souls who sorrow for sin will be shut out from mercy, or that any will be refused the benefit of Christ's sacrifice, who are willing to accept these blessings. Him that cometh unto Christ, he will in no wise cast out.

26. Compare on this and following verses, Heb 6:4, &c. There the warning was that if there be not diligence in progressing, a falling off will take place, and apostasy may ensue: here it is, that if there be lukewarmness in Christian communion, apostasy may ensue.

if we sin—Greek present participle: if we be found sinning, that is, not isolated acts, but a state of sin [Alford]. A violation not only of the law, but of the whole economy of the New Testament (Heb 10:28, 29).

wilfully—presumptuously, Greek "willingly." After receiving "full knowledge (so the Greek, compare 1Ti 2:4) of the truth," by having been "enlightened," and by having "tasted" a certain measure even of grace of "the Holy Ghost" (the Spirit of truth, Joh 14:17; and "the Spirit of grace," Heb 10:29): to fall away (as "sin" here means, Heb 3:12, 17; compare Heb 6:6) and apostatize (Heb 3:12) to Judaism or infidelity, is not a sin of ignorance, or error ("out of the way," the result) of infirmity, but a deliberate sinning against the Spirit (Heb 10:29; Heb 5:2): such sinning, where a consciousness of Gospel obligations not only was, but is present: a sinning presumptuously and preseveringly against Christ's redemption for us, and the Spirit of grace in us. "He only who stands high can fall low. A lively reference in the soul to what is good is necessary in order to be thoroughly wicked; hence, man can be more reprobate than the beasts, and the apostate angels than apostate man" [Tholuck].

remaineth no more sacrifice—For there is but ONE Sacrifice that can atone for sin; they, after having fully known that sacrifice, deliberately reject it.