In the excerpt from act 3, scene 2, of Julius Caesar. Brutus's reason for giving his monologue compares to Antony's reason for giving his in that Brutus announces that he wants to explain why he killed Caesar, while Antony says that he is simply there to give Caesar a proper burial.
Brutus exposes himself in front of all the people of Rome, telling them to be the judge of his actions. He declares that he devoted himself to Rome and that is why he did what he did (he killed Caesar), even though that, according to him, he loved Caesar as much as them.
On the other hand, Antony declares that he was not there to praise Caesar, but as a good friend of him, he wanted to give him a proper burial. He considers that Caesar's actions must be judged as they were, and that if a man has done harm in life, it stays with his memory after his departure, whereas good actions vanish in time.