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.

And the vote of the Lacedaemonians that the treaty had been broken and tliat they must go to war was determined, not so much by the influence of the speeches of their allies, as by fear of the Athenians, lest they become too powerful, seeing that the greater part of Hellas was already subject to them.