History of the Peloponnesian War
Thucydides
Thucydides, Vol. 1-4. Smith, Charles Foster, translator. London and Cambridge, MA: Heinemann and Harvard University Press, 1919-1923.
But we are the same now as we were then, and if we are in our right minds, we shall not permit our allies to be wronged or even put off avenging their wrongs, since they cannot longer put off suffering them.
Others, indeed, may have money in abundance and ships and horses,[*](cf. Thuc. 1.80.3.) but we have brave allies, and they must not be delivered over to the Athenians; nor must we seek redress by means of legal processes and words when it is not in word only that we ourselves are being injured, but we must avenge them speedily and with all our might.
And let no man tell us that it befits us to deliberate when a wrong is being done us; nay, it befits rather those who intend to do us a wrong to deliberate a long time.
Vote, therefore, Lacedaemonians, for the war as beseems the dignity of Sparta, and do not permit the Athenians to become too great; and let us not prove false to our allies, but let us with the favour of the gods go against the wrong-doer."