The fear of committing this sin is the proof that you haven't.
Blasphemy against the Holy Spirit is your heart's rejection of the Spirit's work.
It will come out in your words. (12:34)
(John 16) The Spirit's work- to convict the world in regard to
The Bible is also the work of the Holy Spirit.
(II Timothy 3:16, II Peter 1:21)
Rejecting the Bible as absolute truth is also rejecting the work of the Holy Spirit.
One more sign would be given to prove who Jesus was- the resurrection.
There is a division to be made- those who are with Jesus and those who are against Him (30)
If you have been born again, you never have to worry about whether you've done something God can't forgive.