Moore, of course, thought that intrinsic value is the central evaluative property. Admittedly, specifying what counts as an intrinsic property is an interesting and difficult question in itself. Let me offer just a quick sketch. On this proposal, whether an object has an intrinsic property cannot be affected by anything outside the object. This entails that all possible duplicates of an object have all the same intrinsic properties as the object but they can differ in all their other properties that are thus extrinsic. Metaphysically speaking, Moore then thought that the intrinsic property of intrinsic value is a ‘non-natural’ property. Again, it is an interesting and difficult question what this actually means – what the difference between non-natural and natural properties is exactly supposed to amount to. As this doesn’t matter below, I’ll be neutral about this here.
One classic objection to non-naturalism about intrinsic value is an epistemic challenge. As John Mackie put it, ‘[c]orrespondingly, if we were aware of them, it would have to be by some special faculty of moral perception or intuition, utterly different from our ordinary ways of knowing everything else.’ So, traditionally, it has been thought that it is the non-naturalist aspect of Moore’s view that creates the epistemic problems. I want to suggest that this is false because the problem really is in the intrinsic aspect of Moore's properties. David Lewis, in his 2002 Gareth Evans Memorial lecture ‘Ramseyan Humility’, offers a strong argument to the conclusion that all intrinsic properties are unknowable – whether they be non-natural or natural properties (I wish I had read this earlier... most people probably know this well). If this is right (and I think it is), then naturalists about intrinsic value face the very same epistemic problems as the non-naturalists about intrinsic value.
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