Kantians, of course, will think that I have lost the plot from the start, and that only confusion can result from failure to make these essential, utterly fundamental divisions between “is†and “ought,†fact and value, or the descriptive and the normative, in as rigorous and systematic a way as possible, just as I think they have fallen prey to a kind of fetishism, attributing to a set of human conceptual invention a significance they do not have. … In some contexts, a relative distinction between the facts and human valuations of those facts, or norms, might be perfectly useful. But the division makes sense only relative to the context, and can’t be extracted from that context, promoted, and declared to have absolute standing.
Raymond Geuss