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.
Hermocrates spoke to this effect; and after him, Euphemus, the Athenian ambassador, as follows:
"Though we are come hither for the purpose of renewing our former alliance, yet, as the Syracusan orator has attacked us on that head, we must also address you on the subject of our empire, to show that we enjoy it on just grounds.
The strongest proof, then, of this he himself has mentioned, in his assertion that the Ionians have ever been hostile to the Dorians. And such too is the case. For we, who are Ionians, considered, with regard to the Peloponnnesians. who are Dorians, and more numerous than ourselves, and living near us, in what way we might be least subject to them.