What is the blasphemy against the Holy Spirit?

Luke 12:10 contains a chilling reality: there is a sin which will never be forgiven. It is crucial to properly understand this statement, as it carries enormous implications. I usually like to synthesize thoughts from others and create my own post, but in my estimation Scot McKnight nailed it in his article. I cannot emphasize strongly enough that this sin is one which an unbeliever commits against God; this is not a sin which a believer commits, particularly unknowingly. Many believers live in paralysis, fearful that they might commit the unpardonable sin without even knowing it and then be beyond the grip of God's grace. I personally spend a lot of time ministering to others on this topic and have seen the devastation of an improper interpretation/application. Yet another reason to be students of God's Word and dig deep!