Plataicus (37-39)

Indeed they have proved to you how people of such character should be treated by their conduct in the matter of Oropus[*]; for when they hoped that they would have license to do as they pleased they did not treat you as allies, but as ruthlessly wronged you as they would have dared to act against their deadliest enemies. But as soon as you in requital voted to exclude them from the peace,[*] they left off their arrogance and came to you in more humble mood than we Plataeans are in now.

If, then, some of their orators seek to frighten you, arguing that there is danger of the Thebans’ changing sides and going over to the enemy, you must not credit what they say; for they are constrained by compulsions so peremptory that they would much sooner submit to your government than tolerate the alliance with the Lacedaemonians.

But even if they were likely to act altogether otherwise, not even then, in my opinion, does it become you to have greater regard for the city of the Thebans than for your oaths and treaties, when you remember, first, that it is your ancient tradition to fear, not dangers, but acts of infamy aid dishonor; next, that it usually happens that victory in war is not for those who destroy cities by violence, but for those who govern Greece in a more scrupulous and clement manner.[*]