What are the psychological foundations of morality? Historically, the issue has been framed as one of emotion versus reason. Hume argued that reason is the slave of the passions and so morality must be based on them; Kant argued that moral law is given by rational agents to themselves in virtue of their rationality. The debate has continued in these terms to the present day. In Like-Minded, Andrew Sneddon argues that "reason" and "passion" do not satisfactorily capture all the important options for explaining the psychological foundations of morality.