In the second chapter of Utilitarianism John Stuart Mill writes: It is quite compatible with the principle of utility to recognise the fact, that some kinds of pleasure are more desirable and more valuable than others. It would be absurd that while, in estimating all other things, quality is considered as well as quantity, the estimation of pleasures should be supposed to depend on quantity alone.

Mill's Utilitarianism is widely used to introduce elementary students to Moral Philosophy. One reason for this, I trust, is a recognition that Mill's doctrines and interests have an immediate attraction for most people. But certainly another reason is the belief that Mill's arguments contain a number of obvious fallacies, which an elementary student can be led to detect, thereby learning to practise critical philosophy.