 I am extremely grateful to Megan Laverty, Vic Seidler, and Kieran Setiya for acute and incredibly helpful feedback on a late draft of this entry, and equally for their support. I would also like to thank Vic and Megan for our “Murdoch study group” over the past years, and to the “Murdoch reading group”, organized and guided by Mark Hopwood, during the covid period. Many thanks also to SEP editor Stephen Darwall for excellent suggestions.