Q348 : What is the Unpardonable Sin?

Dear Andy,

What is the "blasphemy against the Holy Spirit [which] will not be forgiven" mentioned by Jesus in Matthew 12:31-32, also referred to as the "unpardonable sin"?

A348 : by Andy Woods

I discuss the unpardonable sin, its historical application, and relationship to sin in the present day in presentation 32 Eternal Security^a in my study on Soteriology^b.