The Pharisees have crossed the line now. They have accused Jesus of working with the Enemy and Jesus is furious. He unleashes a lesson full of metaphors and Old Testament references that come to a culmination in a picture that perfectly explains the hardness of the Pharisees' hearts.
In a big moment for the history of the church, Jesus empowers humans to embark on the mission of His Gospel. There is great warning in Jesus' admonition to the apostles, but great hope as well.