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 e g 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