Julius Caesar: Jealousy Jealousy causes many of the characters in The Tragedy of Julius Caesar to commit dangerous and foolish acts. Cassius' jealousy drives him to kill Caesar. All the conspirators, except the noble Brutus, kill Caesar because they feel threatened by his power. Brutus is the only conspirator who murders Caesar for more honorable reasons. Jealousy is a very important theme in this play. Cassius feels very threatened by Caesar's power. He remembers when he was an equal to Caesar, and doesn't think that Caesar deserves this much power. He comments to Brutus, "I was born free as Caesar; so were