What to read after Utilitarianism (功利主義)?

John Stuart Mill's book Utilitarianism is a philosophical defense of utilitarianism in ethics. The essay first appeared as a series of three articles published in Fraser's Magazine in 1861; the articles were collected and reprinted as a single book in 1863. It went through four editions during Mill's lifetime with minor additions and revisions. Although Mill includes discussions of utilitarian ethical principles in other works such as On Liberty and The Subjection of Women, Utilitarianism contains Mill's only major discussion of the fundamental grounds for utilitarian ethical theory. In the first two chapters, Mill aims to define precisely what utilitarianism claims in terms of the general moral principles that it uses to judge concrete actions, as well as in terms of the sort of evidence that is supposed to be given for such principles. He hopes thus to do away with some common misunderstandings of utilitarianism, as well as to defend it against philosophical criticisms, most notably those of Kant. In the first chapter, he distinguishes two broad schools of ethical theory — those whose principles are defended by appeals to intuition and those whose principles are defended by appeals to experience. He identifies utilitarianism as one of the empirical theories of ethics. In the second chapter, Mill formulates a single ethical principle, from which he says all utilitarian ethical principles are derived: The creed which accepts as the foundation of morals, Utility, or the Greatest-Happiness Principle, holds that actions are right in proportion as they tend to promote happiness, wrong as they tend to produce the reverse of happiness. By happiness is intended pleasure, and the absence of pain; by unhappiness, pain, and the privation of pleasure. Most importantly, it is not the agent's own greatest happiness that matters "but the greatest amount of happiness altogether." Utilitarianism, therefore, can only attain its goal of greater happiness by cultivating the nobleness of individuals so that all can benefit from the honor of others. In fact, notes Mill, Utilitarianism is actually a "standard of morality" which uses happiness of the greater number of people as its ultimate goal.