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.
on the contrary, we openly maintained that each one should discipline his own allies without interference. If you receive and assist evil-doers, you will surely find that full as many of your allies will come over to us, and the precedent you establish will be against yourselves rather than against us.
" These, then, are the considerations of right which we urge upon you—and they are adequate according to the institutions of the Hellenes; but we have also to remind you of a favour and to urge a claim based upon it;
and since we are not your enemies so as to want to injure you, nor yet your friends so that we could make use of you, we think this favour should be repaid us at the present time. It is this: when once, before the Persian war, you were deficient in battle-ships for the war you were waging with the Aeginetans, you borrowed twenty from the Corinthians. And this service and that we rendered in connection with the Samians—our preventing the Peloponnesians from aiding themenabled you to prevail over the Aeginetans and to chastise the Samians.