If he is poor who is full of Desires, nothing can equal the Poverty of the Ambitious and the Covetous.
 
[S’il est vrai que l’on soit pauvre par toutes les choses que l’on désire, l’ambitieux et l’avare languissent dans une extrême pauvreté.]

Jean de La Bruyère (1645-1696) French essayist, moralist

The Characters [Les Caractères], ch. 6 “Of Gifts of Fortune [Des Biens de Fortune],” § 49 (6.49) (1688) [Browne ed. (1752)]
    (Source)

(Source (French)). Alternate translations:

If he is only poor who desires much, and is always in want; the Ambitious and the Covetous languish in extreme Poverty.
[Bullord ed. (1696)]

If a Man is poor, by all the things which he longs for, the Ambitious and Covetous languish in extreme Poverty.
[Curll ed. (1713)]

If a man be poor who wishes to have everything, then an ambitious and a miserly man languish in extreme poverty.
[tr. Van Laun (1885)]

If it is true that poverty consists in desiring a great many things, the ambitious man and the miser suffer from extreme poverty.
[tr. Stewart (1970)]