Since you raised it, how about you teaching us what blasphemy against the Holy Ghost is?
Here's the English literal from the Greek for your edification:
Mathew 12:30 - 32
'He who is not with me is against me, and he who is not gathering with me, doth scatter.
Because of this I say to you, all sin and evil speaking shall be forgiven to men, but the evil speaking of the Spirit shall not be forgiven to men.
And whoever may speak a word against the Son of Man it shall be forgiven to him, but whoever may speak against the Holy Spirit, it shall not be forgiven him, neither in this age, nor in that which is coming.
As for the blasphemy against the Holy Ghost, the clarity is found in Docrine and Covenants Section 132. It illustrates several points already addressed, namely priesthood, Temple covenants, and the shedding of innocent blood (murder). It also illustrates why Cain became a son of perdition and why David's soul will not be left in hell.