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 tell the Egestaeans in particular that, as they went to war with the Selinuntians in the first place without the Athenians, so they must bring it to an end by themselves; and for the future let us not make allies, as we are wont to do, whom we must assist when they fare ill, but from whom we shall get no help when we are ourselves in need.