httpwwwcuyamacaedubrucethompsonFallaciesnaturalisticasp Also from the Routledge Dictionary of Philosophy Modern discussions start from two famous attacks on these two forms respectively by Moore and Hume Moore insisted that good is indefinable and that the questions what good means and what things are good must be sharply distinguished eg pleasure may be good and even possibly the only good thing but good does not mean pleasant or producing pleasure etc He called the neglect of this distinction the naturalistic fallacy and said goodness is a nonnatural quality