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.
We, on the other hand, shall have to risk our money and our lives against each separate state, and when we succeed we shall recover a ruined state and be deprived for the future of its revenue, the source of our strength, whereas if we fail we shall be adding fresh enemies to those we have already, and when we should be resisting our present foes we shall be fighting our own allies.
"We must not, therefore, hold out to them any hope, either to be secured by eloquence or purchased by money, that they will be excused on the plea that their error was human. For their act was no unintentional injury but a deliberate plot;
and it is that which is unintentional which is excusable. Therefore, I still protest, as I have from the first,[*](Referring to what happened in the assembly of the day before, in which, however, he had urged the action that was taken; its reconsideration was not urged till the present meeting.) that you should not reverse your former decision or be led into error by pity, delight in eloquence, or clemency, the three influences most prejudicial to a ruling state.
For compassion may rightly be bestowed upon those who are likewise compassionate and not upon those who will show no pity in return but of necessity are always enemies. As to the orators who charm by their eloquence, they will have other opportunities of display in matters of less importance, and not where the city for a brief pleasure will pay a heavy penalty while they themselves get a fine fee for their fine speaking. And clemency would better be reserved for those who will afterwards be faithful allies than be shown to those who remain just what they were before and no whit the less our enemies. "I can sum up what I have to say in a word.