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 if it should turn out that these two lines of action are both inopportune, each for the side which adopts it, then some profit may come from exhortations which advise a compromise.