History of the Peloponnesian War

Our fathers, at any rate, withstood the Persians, although they had no such resources as ours, and abandoned even those which they possessed, and by their resolution more than by good fortune and with a courage greater than their strength beat back the Barbarian and advanced our fortunes to their present state. And we must not fall short of their example, but must defend ourselves against our enemies in every way, and must endeavour to hand down our empire undiminished to posterity."