Matthew 12:31-32 (NKJV)
"Therefore I say to you, every sin and blasphemy will be forgiven men, but the blasphemy against the Spirit will not be forgiven men. Anyone who speaks a word against the Son of Man, it will be forgiven him; but whoever speaks against the Holy Spirit, it will not be forgiven him, either in this age or in the age to come.
Is there a point of no return in rejecting God's offer of salvation? This verse strongly suggests that there is. The good news in this verse is the incredible extent to which forgiveness of sin is available. You can reject and speak against Jesus Christ and even that sin will be forgiven. You might not understand the words of the Bible. You might not understand what people tell you about God. That is OK. But when the Holy Spirit communicates directly to you, there is no way not to understand. To speak against such divine knowledge is unforgivable and demonstrates a hardheartedness that is incapable of repentance.
Many young Christians have feared that they have committed this unpardonable sin. Not to worry; those who desire to repent, by this very desire, demonstrate that they have not committed this sin!
John 3:36 (NKJV)
He who believes in the Son has everlasting life; and he who does not believe the Son shall not see life, but the wrath of God abides on him."