The History of the Grecian War (1.78.3-1.79.1)

And men, when they go to war, use many times to fall first to action, the which ought to come behind; and when they have taken harm, then they fall to reasoning.

But since we are neither in such error ourselves, nor do find that you are, we advise you, whilst good counsel is in both our elections, not to break the peace nor violate your oaths, but according to the articles, let the controversy be decided by judgment; or else we call the gods you have sworn by to witness that if you begin the war, we will endeavour to revenge ourselves the same way that you shall walk in before us.

Thus spake the Athenians. After the Lacedaemonians had heard both the complaints of the confederates against the Athenians and the Athenians' answer, they put them everyone out of the court and consulted of the business among themselves.