The tendencies to find room for motive and character in the area of imperfect duty, and to assimilate virtue with continence, resurface in the writings of several moral philosophers of the 17th and 18th centuries. Immanuel Kant (1724–1804) is an illustrative case. In the Metaphysics of Morals, Kant divides moral philosophy into two domains, that of justice or law on the one hand (the Doctrine of Right), and that of ethics or virtue on the other (the Doctrine of Virtue). The duties that form the