Bradbury again has Faber use an allusion while talking to Montag. He is telling Montag that even Caesar had foes and no one can be completely happy and in power. Faber thinks that when they burn books it is showing how stupid they are.
This line is spoken by Faber when he and Montag are talking at his house. The basic idea of the line is that books act to keep us from doing stupid things.
In this passage, Faber is referring to the idea that when Roman emperors had parades, someone supposedly