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 that if you wish any thing else, you run a risk of being deprived of all. And have done with such reports as these, knowing that they are brought to those who are aware of, and will not tolerate, your designs. For this city, even if the Athenians are coming, will resist them in a manner worthy of itself; and we have generals who will look to these matters. And if none of the reports be true, (which is my opinion,) it will not lay a voluntary slavery on itself, by being panic-struck at your intelligence, and by choosing you as its rulers; but will look at the circumstances itself, and consider the words spoken by you as equivalent to deeds; and will not be deprived of its present liberty by listening to you, but will endeavour to preserve it by being cautious in its actions, and not allowing you to go unpunished.
To this effect spoke Athenagoras. One of the generals then rose up, and would no longer permit any one else to come forward, but himself spoke on the subject before them to the following effect:
It is neither prudent for any parties to utter calumnies against each other, nor for those who hear them to admit them; but rather to see, with regard to the intelligence brought to us, how we may prepare, both each man severally and the whole city together, to defend ourselves well against the invaders.
And even supposing it not to be required, there is no harm, at any rate, in the state being equipped with horses, and arms, and every thing else in which war rejoices.