On Benefits 2.27 ¶2 — Seneca

Seneca, On Benefits 2.27 ¶2

Greed does not permit anyone to be grateful; for what is given is never equal to its base desires, and the more we receive the more we covet, for avarice is much more eager when it has to deal with great accumulations of wealth, just as the power of a flame is enormously greater in proportion to the size of the conflagration from which it springs. Ambition in like manner suffers no man to rest satisfied with that measure of public honours, to gain which was once the limit of his wildest hope; no one is thankful for becoming tribune, but grumbles at not being at once promoted to the post of praetor; nor is he grateful for this if the consulship does not follow; and even this does not satisfy him if he be consul but once. His greed ever stretches itself out further, and he does not understand the greatness of his success because he always looks forward to the point at which he aims, and never back towards that from which he started.