How does the quote from Pericles at the beginning of the text contribute to the author’s depiction of Athens?

How does the quote from Pericles at the beginning of the text contribute to the author's depiction of Athens? ... It proves that Athens was the most powerful city throughout all of Greece.

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cassius, casca, and their allies plant false documents to manipulate brutus to join their cause to remove caesar. after doing so, they visit brutus at night in his home to persuade him of their views. there they plan caesar's death. brutus is troubled but refuses to confide in his devoted wife, portia. on 15 march, caesar's wife, calpurnia, urges him not to go to the senate. she has had visionary dreams and fears the portents of the overnight storms.