There are 3 parts to this word picture;

a) Jesus says He casts out Satan through the power of God not Satan.

b) The sins of man can be forgiven.

c) That blasheme against the Holy Spirit will not be forgiven.

The message, I think is that God can remove evil and even forgive man's sins but man cannot believe in any other God and if man rejects the Holy Spirit he is doomed 

Jesus was sent to be an example to us of dealing with the normal human pain and suffering of this life as well as to pay the ransom for our sins.

To forgive people who inflict pain and injury on us is taught by Jesus and this is the basic difference to the Jewish law where retribution of pain and injury is prescribed as "an eye for an eye' principle.

The spiritual seperation of Jesus is at the point of death, so that we all must reach this same point and we must pray that the belief in Jesus will carry us onto the Kingdom of God