Sallust Catilinae Coniuratio 10

But when, by perseverance and integrity, the republic had increased its power; when mighty princes had been vanquished in war; ¹ when barbarous tribes and populous states had been reduced to subjection; when Carthage , the rival of Rome 's dominion, had been utterly destroyed, and sea and land lay every where open to her sway, Fortune then began to exercise her tyranny, and to introduce universal innovation. To those who had easily endured toils, dangers, and doubtful and difficult circumstances, ease and wealth, the objects of desire to others, became a burden and a trouble. At first the love of money, and then that of power, began to prevail, and these became, as it were, the sources of every evil. For avarice subverted honesty, integrity, and other honorable principles, and, in their stead, inculcated pride, inhumanity, contempt of religion, and general venality. Ambition prompted many to become deceitful; to keep one thing concealed in the breast, and another ready on the tongue; ² to estimate friendships and enmities, not by their worth, but according to interest; and to carry rather a specious countenance than an honest heart. These vices at first advanced but slowly, and were sometimes restrained by correction; but afterward, when their infection had spread like a pestilence, the state was entirely changed, and the government, from being the most equitable and praiseworthy, became rapacious and insupportable.