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.
"If, however, they should come, as it is reported, I think Sicily more competent to carry the war through than the Peloponnesus, inasmuch as it is better provided in all respects, and that our city by itself is much stronger than this army which now, as they say, is coming on—aye, even if it should come in twice the number. For I know that neither horses will accompany them—and from here also none will be provided, except a few from Egesta— nor hoplites equal in number to ours, since they have to come on ships; for it is a great thing to make the long voyage to Sicily even with their ships alone, lightly laden. And the rest of the equipment which must be provided against so large a city as ours is not small.
So much, then, do I differ in my judgment from these men that it seems to me, if they brought with them another city as large as Syracuse and settling here on our borders should wage the war, they would hardly fail to be utterly destroyed; much less, then, when all Sicily is hostile—for it will be united—and they are in a camp pitched just after landing from the ships and cannot venture far from their wretched tents and meagre supplies by reason of our cavalry. In short, I think they would not even get a foothold on the land; so much do I judge our forces to be superior.
"But of these things, as I maintain, the Athenians are aware and they are, I am quite sure, taking care of their own interests, and men from here are fabricating stories neither true nor possible,
men whom not now for the first time but always I have known to be wishing, either by reports such as these and still more mischievous than these, or by overt acts, to frighten the mass of you and themselves dominate the city. And I fear, moreover, that some day, by dint of repeated attempts, they may actually succeed; for we are poor hands at taking precautions before we are at their mercy, and, if we have discovered their plots, at dealing conclusively with the plotters.