Utilitarianism, by John Stuart Mill, is an essay written to provide support for the value of utilitarianism as a moral theory, and to respond to misconceptions about it. Mill defines utilitarianism as a theory based on the principle that "actions are right in proportion as they tend to promote happiness, wrong as they tend to produce the reverse of happiness." Mill defines happiness as pleasure and the absence of pain. He argues that pleasure can differ in quality and quantity, and that pleasures that are rooted in one's higher faculties should be weighted more heavily than baser pleasures. Furthermore, Mill argues that people's achievement of goals and ends, such as virtuous living, should be counted as part of their happiness.