This should be clarified with context, as Jesus was referring to the Pharisees attributing Jesus' works to that of the devil.
If you are afraid you've committed an unforgivable sin, you haven't.
The sin of blaspheming the Holy Spirit is essentially the sin of rejecting Christ.
By continually rejecting God’s free gift of salvation in Jesus, a sinner sears his conscience (ignores the voice of the Holy Spirit) and stiffens his neck. Eventually, he gets to the place where genuine repentance is no longer possible.
This stubborn and unrepentant attitude — persistent self-hardening — is the chief mark of true blasphemy against the Holy Spirit.
Nearly all. There is only one that will never be forgiven, and that is blasphemy against the Holy Spirit.
Matthew 12:1-14
EDIT: To clarify as was stated a bit further down its the Pharisee's actions.
This should be clarified with context, as Jesus was referring to the Pharisees attributing Jesus' works to that of the devil.
If you are afraid you've committed an unforgivable sin, you haven't.
The sin of blaspheming the Holy Spirit is essentially the sin of rejecting Christ.
By continually rejecting God’s free gift of salvation in Jesus, a sinner sears his conscience (ignores the voice of the Holy Spirit) and stiffens his neck. Eventually, he gets to the place where genuine repentance is no longer possible.
This stubborn and unrepentant attitude — persistent self-hardening — is the chief mark of true blasphemy against the Holy Spirit.
source
Thanks for the correction. Meant to go to 14 instead of 8, and got side tracked.