Every thing mortal, by a necessity of nature, is conversant with mutations; some things, indeed, receiving a revolution from a worse to a better condition, but others from a better to a worse. For things that are generated, are increased; when increased, arrive at their acme: after this become old, and at length finally perish. And things, indeed, which are generated by nature, through the same nature terminate in the immanifest; and again from the immanifest accede to mortality, through a permutation of generation; and, by a reciprocation of corruption, form a circular retrogression. And some things, through human folly, from an ebullition of insolence and satiety, when both houses and cities have been exalted to the summit of human felicity, and been exuberantly rich, have perished, together with their much applauded possessions. Thus, also, it happens that every empire is bounded by three times: by one, indeed, and that the first, which comprehends in itself acquisition; by the second, which comprehends fruition; and by the last, which brings with it destruction. For empires at their commencement being destitute of the goods of fortune, are busied in acquisition; but afterwards becoming prosperous, they perish. Such things, therefore, as are under the dominion of the gods, being incorruptible, are preserved through the whole of time by incorruptible natures; but such things as are under the government of men, being mortal, receive from mortals a perpetually various mutation. For the end, indeed, of satiety and lascivious insolence is destruction; but a strenuous and worthy life is the end of poverty and narrow circumstances. Not only poverty, however, but many other things bring human life to an end. FROM DIOTOGENES IN HIS TREATISE CONCERNING A KINGDOM.