Although known as "the age of reason," the eighteenth century was actually an era in which many leading moral and political philosophers placed equal emphasis on feeling. While Enlightenment rationalists such as Immanuel Kant separated reflective reason from the unreflective mental faculties which must obey its commands, their sentimentalist contemporaries such as David Hume, Adam Smith, and J. G. Herder did not. Instead, they saw moral and political reflection as the proper work of the mind as a whole. Without emotion, imagination and the imaginative sharing of emotion then known as "sympathy," we would be incapable of developing the reflectively-refined moral sentiments which are the basis of our commitment to justice and virtue. This boo...