You know well as I do that when we are talking on the human plane, questions of justice only arise when there is equal power to compel: in terms of practicality the dominant exact what they can and the weak concede what they must. (Said by Athenian envoy to the Melians)

and their judgment was based more upon blind wishing than upon any sound prediction; for it is a habit of mankind to entrust to careless hope what they long for, and to use sovereign reason to thrust aside what they do not desire.

The goodness of the land favored the enrichment of particular individuals, and thus created faction which proved a fertile source of ruin. It also invited invasion. [5] Accordingly Attica,5a from the poverty of its soil enjoying from a very remote period freedom from faction, [6] never changed its inhabitants. And here is no minor example of my assertion that the migrations were the cause of there being no correspondent growth in other parts.

The cause of all this was the pursuit of power driven by greed and ambition, leading in turn to the passions of the party rivalries thus established. The dominant men on each side in the various cities employed fine-sounding terms, claiming espousal either of democratic rights for all or of a conservative aristocracy, but the public whose interests they professed to serve were in fact their ultimate prize

Even more extraordinary is Thucydides’ ability to use that knowledge to reach a higher wisdom about the nature of human behavior, whether it be unveiled by plague (2.53), revolution (3.82–84), or war (5.103). And never forget that Thucydides was much more than an accurate recorder, more even than a keen judge of human character and the role that natural law and chance play in men’s affairs (3.45.5–7; 3.84.1–3). He was a profound literary artist as well, emotional and poignant on so many surprising occasions.

Yet we know that in war fortune sometimes makes the odds more level than could be expected from the difference in numbers of the two sides. And if we surrender, then all our hope is lost at once, whereas, so long as we remain in action, there is still a hope that we may yet stand upright.

Meanwhile the party opposed to the traitors proved numerous enough to prevent the gates being immediately thrown open, and in concert with Eucles, the general, who had come from Athens to defend the place, sent to the other commander in Thrace, Thucydides, son of Olorus, the author of this history, who was at the isle of Thasos, a Parian colony, half a day's sail from Amphipolis, to tell him to come to their relief.

Civil war brought many hardships to the cities, such as happen and will always happen as long as human nature is the same, although they may be more or less violent or take different forms, depending on the circumstances in each case.