An Introduction to the Principles of Morals and Legislation An Introduction to the Principles of Morals and Legislation An Introduction to the Principles of Morals and Legislation is a book by the English philosopher and legal theorist Jeremy Bentham "originally printed in 1780, and first published in 1789." Bentham's "most important theoretical work," it is where Bentham develops his theory of utilitarianism and is the first major book on the topic. Bentham was the first major philosopher to develop and defend a utilitarian theory of ethics. Like John Stuart Mill, whom he greatly influenced, Bentham believed that happiness or pleasure is the only thing that is good for its
Jeremy Bentham came to expressing it was in the form "the good and happiness of the members, that is the majority of the members of any state, is the great standard by which every thing relating to that state must finally be determined". The "greatest happiness principle", or the principle of utility, forms the cornerstone of all Bentham's thought. By "happiness", he understood a predominance of "pleasure" over "pain". He wrote in "The Principles of Morals and Legislation": Bentham was a rare major figure in the history of philosophy to endorse psychological egoism. Bentham was a determined opponent of religion. Crimmins observes: