I have never totally understood the unforgiveable sin. When I read verse 10 I got out my life application bible and looked to see what it said. "Jesus said that blasphemy against the Holy Spirit is unforgiveable. This has worried many sincere Christians, but it does not need to. The unforgiveable sin means attributing to Satan the work that the Holy Spirit accomplishes. Thus it is deliberate and ongoing rejection of the Holy Spirit's work and even of God himself. A person who has committed this sin has shut himself or herself off from God so thoroughly that he or she is unaware of any sin at all. A person who fears having committed it shows, by his or her very concern, that he or she has not sinned in this way." This helped me alot. I hope it helps someone who is reading this.

Luke 12:10