"believe me for mine honour, and have respect to mine honour, that you may believe: censure me in your wisdom, and awake your senses, that you may the better judge" (3.2.61). He wants people to know he is honorable and he is a good Roman.
"Here comes his body, mourned by Mark Antony: who, though he had no hand in his death, shall receive the benefit of his dying" (3.2.61). Brutus is telling the Romans how Antony is mourning over Caesar's death.
"that, as I slew me best lover for the good of Rome, I have the same dagger for myself, when it shall please my country to need my death" (3.2.61). They can not argue that he wouldn't kill himself or have someone else kill him, because they killed Caesar for his ambition.