Men often, from infirmity of character, make their election for the nearer good, though they know it to be less valuable; and this no less when the choice is between two bodily pleasures than when it is between bodily and mental. They pursue sensual indulgences to the injury of health, though perfectly aware that health is the greater good. It may be further objected that many who begin with youthful enthusiasm for everything noble, as they advance in years, sink into indolence and selfishness. But I do not believe that those who undergo this very common change voluntarily choose the lower description of pleasures in preference to the higher. I believe that, before they devote themselves exclusively to the one, they have already become incapable of the other. Capacity for the nobler feelings is in most natures a very tender plant, easily killed, not only by hostile influences, but by mere want of sustenance; and in the majority of young persons it speedily dies away if the occupations to which their position in life has devoted them, and the society into which it has thrown them, are not favorable to keeping that higher capacity in exercise. Men lose their high aspirations as they lose their intellectual tastes, because they have not time or opportunity for indulging them; and they addict themselves to inferior pleasures, not because they deliberately prefer them, but because they are either the only ones to which they have access or the only ones which they are any longer capable of enjoying. It may be questioned whether anyone who has remained equally susceptible to both classes of pleasures ever knowingly and calmly preferred the lower, though many, in all ages, have broken down in an ineffectual attempt to combine both.
John Stuart Mill, Utilitarianism, Chapter 2