"Things are also stacked against us in the fulfillment of our desires and the satisfaction of our preferences. Many of our desires are never fulfilled. There are thus more unfulfilled than fulfilled desires. Even when desires are fulfilled, they are not fulfilled immediately. Thus, there is a period during which those desires remain unfulfilled. Sometimes, that is a relatively short period (such as between thirst and, in ordinary circumstances, its quenching), but in the case of more ambitious desires, they can take months, years, or decades to fulfill. Some desires that are fulfilled prove less satisfying than we had imagined. One wants a specific job or to marry a particular person, but upon attaining one’s goal, one learns that the job is less interesting or the spouse is more irritating than one thought. Even when fulfilled desires are everything that they were expected to be, the satisfaction is typically transitory, as the fulfilled desires yield to new desires. Sometimes, the new desires are more of the same. For example, one eats to satiety but then hunger gradually sets in again and one desires more food. The “treadmill of desires” works in another way too. When one can regularly satisfy one’s lower-level desires, a new and more demanding level of desires emerges. Thus, those who cannot provide for their own basic needs spend their time striving to fulfill these. Those who can satisfy the recurring basic needs develop what Abraham Maslow calls a “higher discontent” that they seek to satisfy. When that level of desires can be satisfied, the aspirations shift to a yet higher level. Life is thus a constant state of striving. There are sometimes reprieves, but the striving ends only with the end of life. Moreover, as should be obvious, the striving is to ward off bad things and attain good things. Indeed, some of the good things amount merely to the temporary relief from the bad things. For example, one satisfies one’s hunger or quenches one’s thirst. Notice too that while the bad things come without any effort, one has to strive to ward them off and attain the good things. Ignorance, for example, is effortless, but knowledge usually requires hard work."