“He’s out of his mind,”

Mark 3:21-22 NLT

When his family heard what was happening, they tried to take him away. “He’s out of his mind,” they said. But the teachers of religious law who had arrived from Jerusalem said, “He’s possessed by Satan, the prince of demons. That’s where he gets the power to cast out demons.”
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“I tell you the truth, all sin and blasphemy can be forgiven,  but anyone who blasphemes the Holy Spirit will never be forgiven. This is a sin with eternal consequences.”Mark 3:28-29

Does it scare you when you read about the unforgiveable sin?

It should! It's not murder, genocide, racism, paedophilia or rape that are unforgiveable. They'll be forgiven.

The unforgiveable sin is misrepresentation of the work of God. In the Gospel according to Mark, Jesus' enemies claimed God's Son, Jesus, was actually controlled by Satan.

The Pharisees claimed to represent God. They claimed they knew what God was doing. And with that authority they declared that Jesus was not from God but was actually from Satan. Persisting along these lines would further blind them to the truth and harden their hearts.
Jesus was from God. The Holy Spirit of God was leading Jesus and empowering him. The best news God ever proclaimed was that Jesus, the Son of God, was the Saviour of the World who came from the Father to forgive sinners and welcome them into God’s kingdom.

The Pharisees, claiming to be speaking from a position of God’s authority, were saying God's Saviour Jesus was in fact from Satan.

Jesus says that's unforgiveable!

Interestingly, Jesus' family was also misrepresenting Jesus. They were saying he was crazy. Now we know  Jesus' mother was a believer, and we know at least one of Jesus' brothers is not only a believer but becomes the leader of the church in Jerusalem.
Jesus wasn't crazy. Just because he was healing people, missing meals and working hard proclaiming the Kingdom of God, was no reason to say he was "out of his mind".  Still Jesus isn't really rebuking his family with the same severity that he has the Pharisees.
Jesus is saying his family is God's family! And that included a lot of people.
Do you see why what the Pharisees were saying was so much worse? Jesus was welcoming people into God's family and He alone was the only way anyone would ever get in. Without Jesus no one would ever be saved. The Pharisees were, in effect, going to damn every one in the whole world to God's wrath and judgment by claiming the only rescue God sent was from Satan.

Jesus is not from Satan! 

He is not out of his mind either.

Jesus is God's much anticipated Messiah King who comes to welcome sinners into God's kingdom. Jesus calls the sinner to repent of his sin and to believe in Jesus and his way of life through the cross.
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Mark 3:20-35 NLT

One time Jesus entered a house, and the crowds began to gather again. Soon he and his disciples couldn’t even find time to eat. When his family heard what was happening, they tried to take him away. “He’s out of his mind,” they said. But the teachers of religious law who had arrived from Jerusalem said, “He’s possessed by Satan, the prince of demons. That’s where he gets the power to cast out demons.” Jesus called them over and responded with an illustration. “How can Satan cast out Satan?” he asked. “A kingdom divided by civil war will collapse.  Similarly, a family splintered by feuding will fall apart.  And if Satan is divided and fights against himself, how can he stand? He would never survive.  Let me illustrate this further. Who is powerful enough to enter the house of a strong man like Satan and plunder his goods? Only someone even stronger—someone who could tie him up and then plunder his house. “I tell you the truth, all sin and blasphemy can be forgiven,  but anyone who blasphemes the Holy Spirit will never be forgiven. This is a sin with eternal consequences.”  He told them this because they were saying, “He’s possessed by an evil spirit.” Then Jesus’ mother and brothers came to see him. They stood outside and sent word for him to come out and talk with them. There was a crowd sitting around Jesus, and someone said, “Your mother and your brothers are outside asking for you.” Jesus replied, “Who is my mother? Who are my brothers?”  Then he looked at those around him and said, “Look, these are my mother and brothers.  Anyone who does God’s will is my brother and sister and mother.”