We've all heard that the only unforgivable sin is blasphemy against the Holy Spirit, but I have yet to hear a good definition as to what constitutes blasphemy againt the Holy Spirit. If possible, back up your definition with scripture. If there is no direct scriptural basis, please post passages to study which imply your definition. When that is done, tell me who can commit such a sin? Saved folk? Unsaved folk? And if saved is your answer what then happens to our definition of eternal security?