History of the Peloponnesian War

But the method is the same, by which they both gained possession of those places, and are attempting to do so with these. For after they had been appointed leaders, by the free choice both of the Ionians and of all who were of Athenian origin, for the purpose of talking vengeance on the Mede; by charging some of them with failure in military service, others with mutual hostilities, and others on any specious plea which they severally had to urge, they reduced them to subjection.

And so they did not withstand the Mede for the sake of liberty—neither these men for that of the Greeks, nor the Greeks for their own—but the former did it to enslave the Greeks to themselves, instead of to the Mede; the latter, to get a new master, one not more unwise, but more wise for evil.