History of the Peloponnesian War

In their case, it was not before they laid siege to the place, but after they at length understood that we should not tamely suffer it, that they thought of the specious word arbitration. And not satisfied with their own misconduct there, they appear here now requiring you to join with them not in alliance, but in crime, and to receive them in spite of their being at enmity with us.

But it was when they stood firmest, that they should have made overtures to you, and not at a time when we have been wronged, and they are in peril; nor yet at a time when you will be admitting to a share in your protection those who never admitted you to a share in their power, and will be incurring an equal amount of blame from us with those in whose offences you had no hand. No, they should have shared their power with you before they asked you to share your fortunes with them.

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.