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 as for us, how can we fail to suffer loss, incurring the expense of besieging a city because it will not surrender, and, if—we capture it, recovering one that is ruined, and losing thereafter the revenue from it— the source of our strength against our enemies?
We must not, therefore, be such rigorous judges of the delinquents as to suffer harm ourselves, but we must rather see how for the time to come, by punishing moderately, we may have at our service dependent cities that are strong in material resources; and we must deem it proper to protect ourselves against revolts, not by the terror of our laws, but rather by the vigilance of our administration. At present we do just the opposite:
whenever a free people that is forced into subjection revolts, as it naturally will, in order to recover its independence, we think that, as soon as we have subdued it, we must punish it severely.
We ought, on the contrary, instead of rigorously chastising free peoples when they revolt, to watch them rigorously before they revolt, and thus forestall their even thinking of such a thing; and when we have subdued a revolt, we ought to put the blame on as few as possible.[*](In answer to Cleon's demand, 3.39.6.)
"And do you consider, too, how great a mistake you would make in another point also by following Cleon's advice.
At the present time the populace of all the cities is well disposed to you, and either does not join with the aristocrats in revolting, or, if forced to do so, is hostile from the beginning to those who stirred up the revolt; and so, when you go to war, you have the populace of the rebellious city as your allies.