History of the Peloponnesian War

For when they came before the people, and to the question whether they had full power of concluding, had, contrary to what they had said in council, answered No, the Athenians would no longer endure them, but gave ear to Alcibiades, that exclaimed against the Lacedaemonians far more now than ever; and were ready then presently to have the Argives and those others with them brought in, and to make the league; but an earthquake happening before anything was concluded, the assembly was adjourned.

In the next day's meeting, Nicias, though the Lacedaemonians had been abused, and he himself also deceived touching their coming with full power to conclude, yet he persisted to affirm that it was their best course to be friends with the Lacedaemonians and to defer the Argives' business till they had sent to the Lacedaemonians again to be assured of their intention, saying that it was honour unto themselves and dishonour to the Lacedaemonians to have the war put off. For, for themselves, being in estate of prosperity, it was best to preserve their good fortune as long as they might; whereas to the other side, who were in evil estate, it should be in place of gain to put things as soon as they could to the hazard.

So he persuaded them to send ambassadors, whereof himself was one, to require the Lacedaemonians, if they meant sincerely, to render Panactum standing, and also Amphipolis; and if the Boeotians would not accept of the peace, then to undo their league with them, according to the article that the one should not make league with any without the consent of the other.