History of the Peloponnesian War

Thucydides

Thucydides. The history of the Peloponnesian War, Volume 1-2. Dale, Henry, translator. London: Heinemann and Henry G. Bohn, 1851-1852.

but they sent to Delphi and inquired of the god, whether it would be better for them if they went to war : and he answered them, as it is reported, that if they carried on the war with all their might, they would gain the victory; and said that he would himself take part with them, whether called upon or not.