Hence the lust for money first, then for power, grew upon them; these were, I may say, the root of all evils. For avarice destroyed honour, integrity, and all the other noble qualities; taught in their place insolence, cruelty, to neglect the gods, to set a price on everything. Ambition drove many men to become false; to have one thought locked in the breast, another ready on the tongue; to value friendships and enmities not on their merits but by the standard of self-interest, and to show a good front rather than a good heart. At first these vices grew slowly, from time to time they were punished; finally, when the disease had spread like a deadly plague, the state was changed and a government second to none in equity and excellence became cruel and intolerable.

[Igitur primo imperi, deinde pecuniae cupido crevit: ea quasi materies omnium malorum fuere. Namque avaritia fidem, probitatem ceterasque artis bonas subvortit; pro his superbiam, crudelitatem, deos neglegere, omnia venalia habere edocuit. Ambitio multos mortalis falsos fieri subegit, aliud clausum in pectore, aliud in lingua promptum habere, amicitias inimicitiasque non ex re, sed ex commodo aestumare magisque voltum quam ingenium bonum habere. Haec primo paulatim crescere, interdum vindicari; post, ubi contagio quasi pestilentia invasit, civitas inmutata, imperium ex iustissumo atque optumo crudele intolerandumque factum.]

Sallust (c. 86-35 BC) Roman historian and politician [Gaius Sallustius Crispus]
Bellum Catilinae [The War of Catiline; The Conspiracy of Catiline], ch. 10, sent. 3-6 [tr. Rolfe (1931)]
    (Source)

Discussing the corruption of Rome in the years after the final defeat of Carthage.

Alt. trans.:

"A love of money, and a lust for power, took possession of every mind. These hateful passions were the source of innumerable evils. Good faith, integrity, and every virtuous principle, gave way to avarice; and in the room of moral honesty, pride, cruelty, and contempt of the gods succeeded. Corruption and venality were introduced; and everything had its price. Such were the effects of avarice. Ambition was followed by an equal train of evils; it taught men to be false and deceitful; to think one thing, and to say another; to make friendship or enmity a mere traffic for private advantage, and to set the features to a semblance of virtue, while malignity lay lurking in the heart. But at first these vices sapped their way by slow degrees, and were often checked in their progress; but spreading at length like an epidemic contagious, morals and the liberal arts went to ruin; and the government, which was before a model of justice, became the most profligate and oppressive." [tr. Murphy (1807)]

"First a love of money possessed their minds; then a passion for power; and these were the seeds of all the evils that followed. For avarice rooted out faith, probity, and every worthy principle; and, in their stead, substituted insolence, inhumanity, contempt of the gods, and a mercenary spirit. Ambition obliged many to be deceitful; to belie with their tongues the sentiments of their hearts; to value friendship and enmity, not according to their real worth, but as they conduced to interest; and to have a specious countenance, rather than an honest heart. These corruptions at first grew by degrees, and were sometimes checked by correction. At last, the infection spreading like a plague, the state was entirely changed, and the government, from being the most righteous and equitable, became cruel and insupportable." [tr. Rose (1831)]

"Therefore at first the love of money, then that of power increased. These things became as it were the foundation of all evils. For avarice overthrew faith, honesty, and all the other good acts; and instead of them it taught men pride, cruelty, to neglect the gods, and to consider everything venal. Ambition forced many men to become false, to have one thing hidden in their hearts, another ready on their tongue, to value friendships and enmities, not accordingly to reality, but interest, and rather to have a good appearance than a good disposition. These things at first began to increase by degrees, sometimes to be punished. Afterwards when the infection swept on like a pestilence, the state was changed, the government from the most just and best, became cruel and intolerable." [Source (1841)]

"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; 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 afterwards, 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." [tr. Watson (1867)]

"At first the lust of money increased, then that of power, and these, it may be said, were the sources of every evil. Avarice subverted loyalty, uprightness, and every other good quality, and in their stead taught men to be proud and cruel, to neglect the gods, and to hold all things venal. Ambition compelled many to become deceitful; they had one thought buried in their breast, another ready on their tongue; their friendships and enmities they valued not at their real worth, but at the advantage they could bring, and they maintained the look rather than the nature of honest men. These evils at first grew gradually, and were occasionally punished; later, when the contagion advanced like some plague, the state was revolutionized, and the government, from being one of the justest and best, became cruel and unbearable." [tr. Pollard (1882)]

"Hence it was the desire for money first of all, and then for empire, which grew; and these factors were the kindling (so to speak) of every wickedness. For avarice undermined trust, probity, and all other good qualities; instead it taught men haughtiness, cruelty, to neglect the gods, to regard everything as for sale. Ambition reduced many mortals to becoming false, having one sentiment shut away in the heart and another ready on the tongue, assessing friendships and antagonisms in terms not of reality but of advantage, and having a good demeanour rather than a good disposition. At first these things grew gradually; sometimes they were punished; but after, when the contamination had attacked like a plague, the community changed and the exercise of command, from being the best and most just, became cruel and intolerable." [tr. Woodman (2007)]

"At first the desire of power, then the desire of money increased; these were effectively the material of all evils, because avarice overturned faith, probity, and all other noble arts; in their place, it taught men to be arrogant and cruel, to neglect the gods, and to consider all things for sale. Ambition compelled many men to become liars; to hold one thing hidden in the heart, and the opposite thing at the tip of one’s tongue; to judge friends and enemies not in objective terms, but by reference to personal gain; and finally, to make a good appearance rather than to have a good mind. As these vices first began to increase, they were occasionally punished; but afterward, once the contagion had spread like a plague, the state as a whole was altered, and the government, once the noblest and most just, was made cruel and intolerable." [tr. @sententiq (2017)]

That it is the nature of ambition, to make men liars and cheaters; to hide the truth in their breasts, and show, like jugglers, another thing in their mouths; to cut all friendships and enmities to the measure of their own interest, and to make a good countenance without the help of good will. [tr. Cowley? (17th C)]