 Finally, the agent-relative/agent-neutral distinction can also provide a useful lens through which to examine some of the arguments of historical figures. Sidgwick’s famous discussion of the ‘dualism of practical reason’ can now be seen as an instance of the more general tension between agent-relative and agent-neutral reasons. G.E. Moore’s argument against ethical egoism would, if sound, refute agent-relative conceptions more generally (see Moore 1903: 96–105), since Moore’s main objection is not to egoism in particular but (in effect) to agent-relative conceptions of the good more generally.