History of the Peloponnesian War

So then the reality of the grievances we come to complain of and the violence and rapacity of our opponents have both been proved. But that you cannot equitably receive them, this you have still to learn.

It may be true that one of the provisions of the treaty is that it shall be competent for any state, whose name was not down on the list, to join whichever side it pleases. But this agreement is not meant for those whose object in joining is the injury of other powers, but for those whose need of support does not arise from the fact of defection, and whose adhesion will not bring to the power that is mad enough to receive them war instead of peace; which will be the case with you, if you refuse to listen to us.

For you cannot become their auxiliary and remain our friend; if you join in their attack, you must share the punishment which the defenders inflict on them.

And yet you have the best possible right to be neutral, or failing this, you should on the contrary join us against them. Corinth is at least in treaty with you; with Corcyra you were never even in truce. But do not lay down the principle that defection is to be patronized.

Did we on the defection of the Samians record our vote against you, when the rest of the Peloponnesian powers were equally divided on the question whether they should assist them? No, we told them to their face that every power has a right to punish its own allies.

Why, if you make it your policy to receive and assist all offenders, you will find that just as many of your dependencies will come over to us, and the principle that you establish will press less heavily on us than on yourselves.