History of the Peloponnesian War
Thucydides
Thucydides, Vol. 1-4. Smith, Charles Foster, translator. London and Cambridge, MA: Heinemann and Harvard University Press, 1919-1923.
For he had told the Athenians that if they would maintain a defensive policy, attend to their navy, and not seek to extend their sway during the war, or do anything to imperil the existence of the state, they would prove superior. But they not only acted contrary to his advice in all these things, but also in matters that apparently had no connection with the war they were led by private ambition and private greed to adopt policies which proved injurious both as to themselves and their allies; for these policies, so long as they were successful, merely brought honour or profit to individual citizens, but when they failed proved detrimental to the state in the conduct of the war.[*](The reference is especially to the Sicilian expedition; the pernicious results were seen in the Decelean war.)
And the reason for this was that Pericles, who owed his influence to his recognized standing and ability, and had proved himself clearly incorruptible in the highest degree, restrained the multitude while respecting their liberties, and led them rather than was led by them, because he did not resort to flattery, seeking power by dishonest means, but was able on the strength of his high reputation to oppose them and even provoke their wrath. At any rate, whenever he saw them unwarrantably confident and arrogant, his words would cow them into fear;
and, on the other hand, when he saw them unreasonably afraid, he would restore them to confidence again. And so Athens, though in name a democracy, gradually became in fact a government ruled by its foremost citizen.
But the successors of Pericles, being more on an equality with one another and yet striving each to be first, were ready to surrender to the people even the conduct of public affairs to suit their whims.
And from this, since it happened in a great and imperial state, there resulted many blunders, especially the Sicilian expedition,[*](For the history of this expedition, see Books vi and vii.) which was not so much an error of judgment, when we consider the enemy they went against, as of management; for those who were responsible for it, instead of taking additional measures for the proper support of the first troops which were sent out, gave themselves over to personal intrigues for the sake of gaining the popular leadership and consequently not only conducted the military operations with less rigour, but also brought about, for the first time, civil discord at home.
And yet, after they had met with disaster in Sicily, where they lost not only their army but also the greater part of their fleet, and by this time had come to be in a state of sedition at home, they neverthless held out ten years not only against the enemies they had before, but also against the Sicilians, who were now combined with them, and, besides, against most of their allies, who were now in revolt, and later on, against Cyrus son of the King, who joined the Peloponnesians and furnished them with money for their fleet; and they did not finally succumb until they had in their private quarrels fallen upon one another and been brought to ruin.