Corruption in quotes (episode 6)

Then there is a very small remnant, Adeimantus, I said, of worthy disciples of philosophy. ... Those who belong to this small class have tasted how sweet and blessed a possession philosophy is, and have also seen and been satisfied of the madness of the multitude, and known that there is no one who ever acts honestly in the administration of States, nor any helper who will save any one who maintains the cause of the just. Such a savior would be like a man who has fallen among wild beasts—unable to join in the wickedness of his fellows, neither would he be able alone to resist all their fierce natures, and therefore he would be of no use to the State or to his friends, and would have to throw away his life before he had done any good to himself or others. And he reflects upon all this, and holds his peace, and does his own business. He is like one who retires under the shelter of a wall in the storm of dust and sleet which the driving wind hurries along; and when he sees the rest of mankind full of wickedness, he is content if only he can live his own life and be pure from evil or unrighteousness, and depart in peace and good will, with bright hopes.
-Plato, The Republic, 496d

None of the governments, as they now exist, is worthy of the philosophic nature, and hence we see that nature warped and corrupted; just as a foreign seed, when sown in an alien soil, generally loses its native quality, and tends to be subdued and pass into the plant of the country, even so this philosophic nature, so far from preserving its distinctive power, now suffers a decline and takes on a different character.
-Plato, The Republic, 497b

At length corruption, like a general flood
(So long by watchful ministers withstood),
Shall deluge all; and avarice, creeping on,
Spread like a low-born mist, and blot the sun.
Alexander Pope, Moral Essays (1731-35), Epistle III, line 135.