Ch. I:
The Peloponnesian War was prolonged to an immense length, and, long as it was, it was short without parallel for the misfortunes that it brought upon Hellas. Never had so many cities been taken and laid desolate, here by the barbarians, here by the parties contending (the old inhabitants being sometimes removed to make room for others); never was there so much banishing and blood-shedding, now on the field of battle, now in the strife of faction.
All this came upon them with the late war, which was begun by the Athenians and Peloponnesians by the dissolution of the thirty years’ truce made after the conquest of Euboea. To the question why they broke the treaty, I answer by placing first an account of their grounds of complaint and points of difference, that no one may ever have to ask the immediate cause which plunged the Hellenes into a war of such magnitude. The real cause I consider to be the one which was formally most kept out of sight. The growth of the power of Athens, and the alarm which this inspired in Lacedaemon, made war inevitable. Still it is well to give the grounds alleged by either side which led to the dissolution of the treaty and the breaking out of the war.
Ch. X:
And, during the seven days which Eurymedon after his arrival remained with his sixty ships, the Corcyraeans continued slaughtering those of their fellow-citizens whom they deemed their enemies; they professed to punish them for their designs against the democracy, but in fact some were killed from motives of personal enmity, and some because money was owing to them, by the hands of their debtors. Every form of death was to be seen; and everything, and more than everything, that commonly happens in revolutions, happened then. ... To such extremes of cruelty did revolution go; and this seemed to be the worst of revolutions, because it was the first.
For not long afterwards nearly the whole Hellenic world was in commotion; in every city the chiefs of the democracy and of the oligarchy were struggling, the one to bring in the Athenians, the other the Lacedaemonians. Now in time of peace, men would have had no excuse for introducing either, and no desire to do so; but, when they were at war, the introduction of a foreign alliance on one side or the other to the hurt of their enemies and the advantage of themselves was easily effected by the dissatisfied party.
And revolution brought upon the cities of Hellas many terrible calamities, such as have been and always will be while human nature remains the same, but which are more or less aggravated and differ in character with every new combination of circumstances. In peace and prosperity both states and individuals are actuated by higher motives, because they do not fall under the dominion of imperious necessities; but war, which takes away the comfortable provision of daily life, is a hard master and tends to assimilate men's characters to their conditions.
When troubles had once begun in the cities, those who followed carried the revolutionary spirit further and further, and determined to outdo the report of all who had preceded them by the ingenuity of their enterprises and the atrocity of their revenges. The meaning of words had no longer the same relation to things, but was changed by them as they thought proper. Reckless daring was held to be loyal courage; prudent delay was the excuse of a coward; moderation was the disguise of unmanly weakness; to know everything was to do nothing. Frantic energy was the true quality of a man. A conspirator who wanted to be safe was a recreant in disguise. The lover of violence was always trusted, and his opponent suspected.
The tie of party was stronger than the tie of blood, because a partisan was more ready to dare without asking why. (For party associations are not based upon any established law, nor do they seek the public good; they are formed in defiance of the laws and from self-interest.) ... Revenge was dearer than self-preservation.
The cause of all these evils was the love of power, originating in avarice and ambition, and the party-spirit which is engendered by them when men are fairly embarked in a contest. For the leaders on either side used specious names, the one party professing to uphold the constitutional equality of the many, the other the wisdom of an aristocracy, while they made the public interests, to which in name they were devoted, in reality their prize. ... And the citizens who were of neither party fell a prey to both; either they were disliked because they held aloof, or men were jealous of their surviving.