For Nietzsche, when modern intellectuals “believe that they know ‘intuitively’ what is good and evil, when they therefore suppose that they no longer require Christianity as the guarantee of morality,” this is a delusion, and in fact reflects nothing more than the historical “effects of the dominion of the Christian value judgment and… the strength and depth of this dominion” even if “the origin of [the] morality has been forgotten”’ (Twilight of the Idols, p. 516).
Think of the contemporary secular academic moral philosopher who appeals to our “intuitions,” the Rawlsian method of bringing moral theory and our “considered convictions” into “reflective equilibrium,” the liberal activist who glibly appeals to the U.N.’s Universal Declaration of Human Rights as if it were something other than a set of sheer assertions floating in midair, and so forth. All of this, for Nietzsche, would merely confirm his judgment that secular egalitarianism is nothing more than a bundle of sentiments inherited from Christianity and incapable of being given a new rational foundation.
Edward Feser, “Adventures in the Old Atheism, Part I: Nietzsche“, Edward Feser blog, June 13, 2016.
Beneath all their denials there is the natural law indelibly engraved upon their hearts.