Cabala, Jews and Secret Societies

[MNeagle]

What is the 'unpardonable sin'?

ah, found it:

The Unforgivable Sin is simply attributing Jesus' power to perform His miracles to Satan or to one of his demons. When a person says this, he is denying the power and the work of the Holy Spirit. This is the one sin which God will never forgive. Further, once a person commits this sin, the Holy Spirit will stop working in his life, trying to convict him of his sin, and trying to bring him to repentance. Thus, Satan has free access to this person's soul, to do with him what he wishes. Satan can begin to harden this person's heart to monstrous levels.