The most notable effect of ambition in the play is, of course, Caesar's assassination. Caesar had already made himself dictator of Rome; Brutus and the other conspirators thought he wanted to go one better and make himself king, thus destroying the Republic and making slaves of the Roman people. Brutus's ambition is to save the Republic before it's too late, and there's an element of personal ambition here, too, because Brutus sees it as his destiny to save it. Cassius plays upon this overriding sense of destiny to get Brutus involved in the plot to murder Caesar.
Cassius is also driven by personal ambition, but, unlike Brutus, he isn't at the same time motivated by more noble considerations. He sees the overthrow of Caesar as a golden opportunity for enrichment and personal advancement. For Cassius, getting rid of Caesar will make him a very powerful and influential figure in the restored Roman Republic, and so he's not about to lose this once-in-a-lifetime opportunity.
Mark Antony and...
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