  One example of an argument which invokes a specific view is developed by Sarah McGrath (2008). The view in question entails that your belief about some topic does not amount to knowledge if it is “denied by another person of whom it is true that: you have no more reason to think that he or she is in error than you are”. Armed with this principle, McGrath offers an argument to the effect that many of our moral beliefs do not constitute knowledge. What she in particular has in mind are those beliefs that concern issues “that tend to be hotly contested in the applied ethics literature as well as in the broader culture” (92–93), such as the ones about the death penalty and meat-eating. (Derek Parfit considers a challenge which he articulates similarly. See 2011, 546.)