If you mean Hebrews 6:4, then yes it isn't just about a tragic falling into sin like what Paul described back in Romans 7. That was a struggle, but in Romans 7:22 he re-adds that "I delight in the law of God after the inward man"
Hebrews 6:4 is opening the reality that there exist people who, seeing full well the truth of the gospel, the truth of what God did for them and they reject it. They tasted of the word of God that was given them and instead of receiving it, rejected it. This is a very serious reality we face.
The fact of the matter is such people are reprobate of God.
And they know who they are and exactly what they consciously rejected, as hard as it is to conceive, it's out there, according to this scripture passage. There's no license for backsliding and I always like to balance this stuff with what it says in Hebrews 12.
Wherefore seeing we also are compassed about with so great a cloud of witnesses, let us lay aside every weight, and the sin which doth so easily beset us, and let us run with patience the race that is set before us,
Looking unto Jesus the author and finisher of our faith; who for the joy that was set before him endured the cross, despising the shame, and is set down at the right hand of the throne of God. For consider him that endured such contradiction of sinners against himself, lest ye be wearied and faint in your minds.
Ye have not yet resisted unto blood, striving against sin.
And ye have forgotten the exhortation which speaketh unto you as unto children, My son, despise not thou the chastening of the Lord, nor faint when thou art rebuked of him: For whom the Lord loveth he chasteneth, and scourgeth every son whom he receiveth.
If ye endure chastening, God dealeth with you as with sons; for what son is he whom the father chasteneth not?
But if ye be without chastisement, whereof all are partakers, then are ye bastards, and not sons.
Furthermore we have had fathers of our flesh which corrected us, and we gave them reverence: shall we not much rather be in subjection unto the Father of spirits, and live?