ABSTRACT
In this chapter, Parfit gives three main arguments for the conclusion that normative properties are not the same as natural properties and that normative truths do not state natural truths. He defends a version of nonnaturalism about the normative according to which normative truths are akin to mathematical and modal necessities; normative truths about what is morally right and wrong, while necessary, do not entail that there are “ontologically weighty” properties of being right or wrong that are a part of reality.
