Jonathan Crowe

This article considers natural law perspectives on the nature of law. Natural law theories are united by what Mark Murphy calls the natural law thesis: law is necessarily a rational standard for conduct. The natural law position comes in strong and weak versions: the strong view holds that a rational defect in a norm renders it legally invalid, while the weak view holds that a rational defect in a legal norm renders it legally defective. The article explores the motivations for the natural law position, before considering three lines of natural law argument found in the literature. I conclude by examining the arguments offered by John Finnis and Murphy in support of the weak natural law view. I suggest that these arguments fail to impugn the strong natural law thesis. Indeed, the functional argument outlined by Murphy provides a plausible route to a hybrid natural law view that incorporates both weak and strong claims

Natural law ethics holds that practical rationality consists in engaging in non-defective ways with a range of fundamental goods. These basic goods are characteristically presented as reflecting the natural properties of humans, but the details of this picture vary widely. This article argues that natural law ethics can usefully be understood as a type of dispositional theory of value, which identifies the basic goods with those objectives that humans are characteristically disposed to pursue and value for their own sake. Natural law theories of practical rationality can then be understood as attempts to capture the principles that would govern engagement with the basic goods under ideal conditions. The article begins by offering an account of normative inclinations as human dispositions both to act in certain ways and to believe that the actions are worthwhile or required. It then explores the implications of this account for natural law ethics, discussing the role of the basic goods in practical rationality, whether the goods may change over time and the connection between the goods and human nature