IV. We remark with surprise that the progress of nations or {ccxii} the natural growth of institutions which fill modern treatises on political philosophy seem hardly ever to have attracted the attention of Plato and Aristotle. The ancients were familiar with the mutability of human affairs; they could moralize over the ruins of cities and the fall of empires (cp. Plato, Statesman 301, 302, and Sulpicius' Letter to Cicero, Ad Fam. iv. 5); by them fate and chance were deemed to be real powers, almost persons, and to have had a great share in political events. The wiser of them like Thucydides believed that 'what had been would be again,' and that a tolerable idea of the future could be gathered from the past. Also they had dreams of a Golden Age which existed once upon a time and might still exist in some unknown land, or might return again in the remote future. But the regular growth of a state enlightened by experience, progressing in knowledge, improving in the arts, of which the citizens were educated by the fulfilment of political duties, appears never to have come within the range of their hopes and aspirations. Such a state had never been seen, and therefore could not be conceived by them. Their experience (cp. Aristot. Metaph. xi. 21; Plato, Laws iii. 676-9) led them to conclude that there had been cycles of civilization in which the arts had been discovered and lost many times over, and cities had been overthrown and rebuilt again and again, and deluges and volcanoes and other natural convulsions had altered the face of the earth. Tradition told them of many destructions of mankind and of the preservation of a remnant. The world began again after a deluge and was reconstructed out of the fragments of itself. Also they were acquainted with empires of unknown antiquity, like the Egyptian or Assyrian; but they had never seen them grow, and could not imagine, any more than we can, the state of man which preceded them. They were puzzled and awestricken by the Egyptian monuments, of which the forms, as Plato says, not in a figure, but literally, were ten thousand years old (Laws ii. 656 E), and they contrasted the antiquity of Egypt with their own short memories.