History of the Peloponnesian War

Knowing this then, we ought to make peace, individual with individual, and state with state, and to make a common effort to save the whole of Sicily: and the thought should be entertained by no one, that though the Dorian part of us are enemies of the Athenians, the Chalcidian race is secured by its Ionian connexion.

For they are not attacking our nations, because they are different, and from their hatred of one of them; but from coveting the good things of Sicily, which we possess in common. And this they have now shown upon the invitation of the Chalcidian race:

for to those who had never yet assisted them on the ground of their alliance, they themselves with forwardness answered their claim, beyond the letter of the compact. And very excusable is it that the Athenians should practise this covetousness and forecasting;