History of the Peloponnesian War
Thucydides
Thucydides, Vol. 1-4. Smith, Charles Foster, translator. London and Cambridge, MA: Heinemann and Harvard University Press, 1919-1923.
And many were the prophecies recited and many those which oracle-mongers chanted, both among the peoples who were about to go to war and in the Hellenic cities at large.
Moreover, only a short time before this, Delos had been shaken, although it had not before been visited by an earthquake within the memory of the Hellenes.[*](Probably an intentional contradiction of Hdt. 6.98., where it is stated that an earthquake occurred shortly before the battle of Marathon, but none later.)This was said and believed to be ominous of coming events, and indeed every other incident of the sort which chanced to occur was carefully looked into.
The general good-will, however, inclined decidedly to the side of the Lacedaemonians, especially since they proclaimed that they were liberating Hellas. Every person and every state was strongly purposed to assist them in every possible way, whether by word or by deed, and each man thought that wherever he could not himself be present, there the cause had suffered a check.
To such an extent were the majority of the Hellenes enraged against the Athenians, some wishing to be delivered from their sway, others fearful of falling under it.