In this decline of all public virtue, ambition, and not avarice, was the passion that first possessed the minds of men; and this was natural. Ambition is a vice that borders on the confines of virtue; it implies a love of glory, of power, and pre-eminence; and these are objects that glitter alike in the eyes of the man of honour, and the most unprincipled: but the former pursues them by fair and honourable means, while the latter, who finds within himself no resources of talent, depends altogether upon intrigue and fallacy for his success.

[Sed primo magis ambitio quam avaritia animos hominum exercebat, quod tamen vitium propius virtutem erat. Nam gloriam, honorem, imperium bonus et ignavus aeque sibi exoptant; sed ille vera via nititur, huic quia bonae artes desunt, dolis atque fallaciis contendit.]

Sallust (c. 86-35 BC) Roman historian and politician [Gaius Sallustius Crispus]

Bellum Catilinae [The War of Cateline], ch. 11, sent. 1-2 [tr. Murphy (1807)]
    (Source)

Also known as Catilinae Coniuratio [The Conspiracy of Cateline]. (Source (Latin)). Alternate translations:

At first, indeed, the minds of men were less influenced by avarice than ambition, a vice which has some affinity to virtue; for the desire of glory, power, and preferment is common to the worthy and the worthless; with this difference, that the one pursues them by direct means; the other, being void of merit, has recourse to fraud and subtlety.
[tr. Rose (1831)]

But at first ambition more than avarice influenced the minds of the Romans. Which vice however was the nearer to virtue. For glory, honour, command, the good and slothful equally wish for themselves. But the former strives by the right course; to the latter because good qualities are wanting, he works by tricks and deceits.
[Source (1841)]

At first, however, it was ambition, rather than avarice, that influenced the minds of men; a vice which approaches nearer to virtue than the other. For of glory, honor, and power, the worthy is as desirous as the worthless; but the one pursues them by just methods; the other, being destitute of honorable qualities, works with fraud and deceit.
[tr. Watson (1867)]

At first it was not so much avarice as ambition which spurred men's minds, a vice, indeed, but one akin to virtue. Glory, distinction, and power in the state are equally desired by good and bad, though the first strives to reach his goal by the path of honor, the second, in the lack of honest arts, uses the weapons of falsehood and deceit.
[tr. Pollard (1882)]

But at first men’s souls were actuated less by avarice than by ambitions -- a fault, it is true, but not so far removed from virtue; for the noble and the base alike long for glory, honour, and power, but the former mount by the true path, whereas the latter, being destitute of noble qualities, rely upon craft and deception.
[tr. Rolfe (1931)]

At first people's minds were taxed less by avarice than by ambition, which, though a fault, was nevertheless closer to prowess: for the good man and the base man have a similar personal craving for glory, honour, and command, but the former strives along the truth path, whereas the latter, because he lacks good qualities, presses forward by cunning and falsity.
[tr. Woodman (2007)]