Hebrews 10:26 For if we sin wilfully after that we have received the knowledge of the truth, there remaineth no more sacrifice for sins,
Here is another question I have received and I really believe that several people may be asking the same question. This verse really scares people because there are preachers out there who say you cannot sin again if you accept Jesus Christ as your Savior. This is a pure case of you need to read the verse in context. This is explained much better if you look at a verse just a little further down. Hebrews 10:29
29Of how much sorer punishment, suppose ye, shall he be thought 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?
At the time this was written Christianity had gotten so big in the Roman Empire that they had made a law that any Roman soldier who suspected that you were a Christian could pull you into a Roman temple and ask you to deny Christ and have you bow down to Roman gods. Most of the Christians would not do this and paid the penalty of death. However, a few did bow down to the idols and denied Christ. That is what these verses are really pointing to, the ones who denied Christ.
If they had fully believed in Christ, then as the verse says, trodden it under foot and denied the blood convent, how can they reclaim it again the only way would be to re-crucify Christ.
This verse has end time significances as well.
King James Version (KJV)
15And he had power to give life unto the image of the beast, that the image of the beast should both speak, and cause that as many as would not worship the image of the beast should be killed.
16And he causeth all, both small and great, rich and poor, free and bond, to receive a mark in their right hand, or in their foreheads:
17And that no man might buy or sell, save he that had the mark, or the name of the beast, or the number of his name.
The Beast government in the end times has the same law, if you do not worship the beast or take his mark, the government will kill you. Now notice what God will do if you receive the mark of the beast in the next chapter.
King James Version (KJV)
8And there followed another angel, saying, Babylon is fallen, is fallen, that great city, because she made all nations drink of the wine of the wrath of her fornication.
9And the third angel followed them, saying with a loud voice, If any man worship the beast and his image, and receive his mark in his forehead, or in his hand,
10The same shall drink of the wine of the wrath of God, which is poured out without mixture into the cup of his indignation; and he shall be tormented with fire and brimstone in the presence of the holy angels, and in the presence of the Lamb:
You see these verses had a warning at the time they were written, but also a prophetic warning for the end times.
Just to be sure, all your sins past, present and future are forgiven, you cannot lose your salvation. You just cannot deny Christ.