Answer: the impact of fate
Explanation: In this excerpt from Act IV, Scene III of "The Tragedy of Julius Caesar" by William Shakespeare, the central idea that this passage develops is the impact of fate. Brutus is in his tent with Claudio, Lucius and Varrus. The other three men are fast asleep. Brutus cannot sleep. In the dim light, the Ghost of Caesar appears frightening him and making his blood cold. The ghost tells him he is going to see him at Philippi. Throughout the play, there are questions between fate and free will. Brutus believes in the impact of fate, it has a power beyond his control.