History of the Peloponnesian War

Thucydides

Thucydides. The history of the Peloponnesian War, Volume 1-2. Dale, Henry, translator. London: Heinemann and Henry G. Bohn, 1851-1852.

but considering, allies, that we have reached a point of necessity, and, moreover, that what is mentioned is the best course, vote for the war; not being afraid of the immediate danger, but setting your hearts on the more lasting peace that will result from it. For it is by war that peace is rendered the more stable; but to refuse to pass from a state of quiet to one of war is not equally free from danger.

Being of opinion then that the tyrant state which has set itself up in Greece, has set itself up against all alike, so that it already rules over some, and is designing to rule over others, let us go against it and reduce it; and live ourselves free from danger in future, and give freedom to the Greeks who are now enslaved.
To this effect spoke the Corinthians.

The Lacedaemonians, after they had heard from all what they thought, put the question to the vote of all the allies who were present in succession, both to greater and smaller states alike: and the majority voted for war.

But though they had resolved on it, it was impossible to take it in hand immediately, as they were unprepared; but it was determined that suitable means should be provided by the several states, and that there should be no delay. A year, however, did not pass while they were settling all that was necessary, but less, before they invaded Attica, and openly proceeded to the war.

During this time they were sending ambassadors to the Athenians with complaints, in order that they might have as good a pretext as possible for the war, in case they should not listen to them.

In the first place the Lacedaemonians sent ambassadors, and ordered the Athenians to drive out the pollution of the goddess; which pollution was of the following nature.