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.
The god answered them, as it is said, that if they warred with all their might, victory would be theirs, and said that he himself would help them, whether invoked or uninvoked.
But they wished to summon their allies again and put[*](432 B.C.) to them the question whether they should go to war. And when the envoys from the allies had come and an assembly was held, the others said what they wished, most of them complaining of the Athenians and demanding that the war should be entered upon, and especially the Corinthians. They had already, before the meeting, privately begged the allies city by city to vote for the war, fearing lest Potidaea would be destroyed before help came, and now, being also present at this meeting, they came forward last of all and spoke as follows:
" Men of the allies, we can no longer complain of the Lacedaemonians that they have not both themselves voted for the war and also brought us together for this object. And that is right; for it is the duty of leaders, while equitably considering their particular interests, to have special regard for the general weal, just as in other matters they are honoured above all.
Now those of us who have had dealings with the Athenians in the past do not need to be taught to be on our guard against them. But those who dwell more in the interior and away from any trade-route should be warned that, if they do not aid those who are on the seaboard, they will find it more difficult to bring the products of the land down to the sea and to get in return what the sea gives to the mainland; and that they should not be careless judges of what is said here, as though it were no concern of theirs, but should expect that, if they abandon the seacoast to its fate, the danger may possibly some day reach them, and that they are deliberating upon their own interests no less than upon ours.
They ought not, therefore, to hesitate a moment to adopt war in place of peace. For though it is the part of men of discretion to remain tranquil should they not be wronged, it behooves brave men, when wronged, to go from peace to war, but when a favourable opportunity offers to abandon war and resume peace again, allowing themselves neither to be elated by success in war nor to be so enamoured of the quiet of peace as to submit to wrong.