the ultimate end, with reference to and for the sake of which all other things are desirable...is an existence exempt as far as possible from pain, and as rich as possible in enjoyments...This, being, according to the utilitarian opinion, the end of human action, is necessarily also the standard of morality; which may accordingly be defined, the rules and precepts for human conduct, by the observance of which an existence such as has been described might be, to the greatest extent possible, secured to all mankind; and not to them only, but, so far as the nature of things admits, to the whole sentient creation.