History of the Peloponnesian War

For the Lacedaemonians, to whose lot it fell to make restitution first, had not rendered Amphipolis and the other cities, nor had caused the peace to be accepted by the confederates upon Thrace, nor by the Boeotians nor Corinthians, though they had ever professed that in case they refused they would join with the Athenians to bring them to it by force, and had prefixed a time (though not by writing) within the which such as entered not into this peace were to be held as enemies unto both.

The Athenians, therefore, when they saw none of this really performed, suspected that they had no sincere intention, and thereupon refused to render Pylus when they required it; nay, they repented that they had delivered up the prisoners they took in the island; and detained the rest of the towns they then held till the Lacedaemonians should have performed the conditions on their part also.