The author defines the core of utilitarianism as the 'theory of life' where pleasure and the absence of pain are the only inherently desirable ends.

The author defends utilitarianism against the charge that it is a 'doctrine worthy only of swine' by arguing that human beings are capable of higher pleasures than those of mere animals.

Mill argues that the principle of utility must account for the quality of pleasures as well as quantity, suggesting that the preference of those who have experienced both is the ultimate test of superior value.

The author asserts the qualitative superiority of intellectual pleasures over base ones, famously arguing that it is better to be a dissatisfied human or Socrates than a satisfied pig or fool.

Mill argues that people do not voluntarily choose lower pleasures over higher ones, but rather sink into them only after they have lost the capacity to enjoy more noble pursuits.