History of the Peloponnesian War

‘Lacedaemonians and allies, the rule established among the Hellenes is not unknown to us. Those who revolt in war and forsake their former confederacy are favorably regarded by those who receive them, in so far as they are of use to them, but otherwise are thought less well of, through being considered traitors to their former friends.

Nor is this an unfair way of judging, where the rebels and the power from whom they secede are at one in policy and sympathy, and a match for each other in resources and power, and where no reasonable ground exists for the rebellion. But with us and the Athenians this was not the case;