"Believe me for mine honour, and have respect to mine honour, that you may believe: censure me in your wisdom." (3.2) Brutus is establishing his own credibility by so that the people will believe him.
"There is tears for his love; joy for his fortune; honour for his valour; and death for his ambition." (3.2) He is appealing to the people's love for Julius Caesar and twisted it to help support him.
"With this I depart,—that, as I slew my best lover for the good of Rome, I have the same dagger for myself, when it shall please my country to need my death." (3.2) Gives the fact that he slew Caesar and makes it sound like it was a noble deed.