The precise formulation of the doctrine of public reason is subject to further variation. Among other factors, it will depend upon (1) how we discriminate between the reasons that we can and cannot reasonably expect others to endorse; (2) whether its demands apply broadly to any matter of public concern or narrowly only to the essentials of a political constitution (Kelly 2013; Quong 2011: ch. 9); and (3) whether we acknowledge that there may be conditions under which the doctrine is defeated by other considerations, such concerns for religious salvation, for example (Rawls 1996: 152; Clayton and Stevens 2014).