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 it is right to aid us and not be afraid of their armament. For if we all stand together, it is not formidable. The only danger is—and this is just what they are eager for—that we may stand opposed to each other; for not even when they came against us alone and proved superior in battle did they effect what they wished, but quickly went away.
"So then, if only we be united, we have reason not to be disheartened, but rather to enter into the proposed alliance more heartily, especially as aid is sure to come from the Peloponnesians, who are altogether superior to these people in matters of war. And no one should regard as fair to us, while safe for you, that prudent course of yours—to aid neither, forsooth, as being allies of both. Indeed it is not as fair in fact, as when urged to justify you.[*](Or, “as the plea of right represents it.”)