Society had become divided into two ideologically hostile camps, and each side viewed the other with suspicion. - Thucydides

(Corinthians:) The spirit of trust, Lacedaemonians, which animates your own political and social life, makes you distrust others who, like ourselves, have something unpleasant to say, and this temper of mind, though favourable to moderation, too often leaves you in ignorance of what is going on outside your own country, but instead of taking our words to heart, you chose to suspect that we only spoke from interested motives.

In their troubles they naturally called to mind a verse which the elder men among them declared to have been current long ago: — A Dorian war will come and a plague with it.

There was a dispute about the precise expression some saying that limos, a famine, and not loimos, a plague, was the original word. Nevertheless, as might have been expected, for men's memories reflected their sufferings, the argument in favour of loimos prevailed at the time. But if ever in future years another Dorian war arises which happens to be accompanied by a famine, they will probably repeat the verse in the other form.

(Book 2 Chapter 54.2-3)

For the true author of the subjugation of a people is not so much the immediate agent, as the power which permits it having the means to prevent it.