History of the Peloponnesian War

And for the Egestaeans, to answer them in particular thus: that as without the Athenians they had begun the war against the Selinuntians, so they should without them likewise end it; and that we shall no more hereafter, as we have used to do, make such men our confederates, as when they do injury, we must maintain it, and when we require their assistance, cannot have it.