"I speak not to disprove what Brutus spoke, But here i am to speak what I do know." This mode of persuasion was effective because he was talking as a friend of Caesar and not because he was told to do so.
"Caesar might have stood against the world; now he lies there. And none so poor to do him reverence" This mode of persuasion was effective because he used the emotions that he felt to tell the people that the death of Caesar should not be sad.
" I thrice presented him a kingly crown, Which is thrice refused, was this ambitious?" This mode of persuasion is effective by him uses the logic of the death of Caesar and the logic of Rome to persuade the people that power would be in good hands.