He who is not with Me is against Me; and he who does not gather with Me scatters. Therefore I say to you, any sin and blasphemy shall be forgiven people, but blasphemy against the Spirit shall not be forgiven. Whoever speaks a word against the Son of Man, it shall be forgiven him; but whoever speaks against the Holy Spirit, it shall not be forgiven him, either in this age or in the age to come
Truly I say to you, all sins shall be forgiven the sons of men, and whatever blasphemies they utter; whoever blasphemes against the Holy Spirit never has forgiveness, but is guilty of an eternal sin"-- because they were saying, "He has an unclean spirit."
What is the "unforgivable sin"?