Jesus and the Prince of Demons

In today's passage we end up jumping way back in Mark - Luke and Matthew are in synch though. Jesus heals a man who is deaf, and by doing so causes stirrings amongst the Pharisees that he is empowered by Satan. Jesus points out to them how silly this argument is saying that If Satan is out to defeat himself then he could be successful at nothing. He also points out that some of them have been known to successfully cast out demons - and therefore by the same argument are they using Satan's powers too? Finally he tells them that every sin - except one can be forgiven, and that one is Blasphemy against the Holy Spirit.