In his speech to the plebeians, Brutus’ cites Caesar’s ambition as justification for his murder: "As Caesar loved me, I weep for him; as he was fortunate, I rejoice at it; as he was valiant, I honor him; but as he was ambitious, I slew him." Earlier, Brutus indicated that he was motivated not by personal animosity toward Caesar, but out of concern for the general welfare of Rome: "I know no personal cause to spurn at him, but for the general."

In contrast, Cassius’ motivation was personal. His attitude toward Caesar reflected resentment and envy.: "He doth bestride the narrow world like a colossus, and we petty men walk under his huge legs and peep about to find ourselves dishonorable graves."