In his Metaphysics of Morals (particularly in the Doctrine of Virtue ), but also in other late works, Kant extends and refines the content of his earlier works on ethics ( Groundwork and Critique of Practical Reason ) to a considerable extent. These revisions and extensions not only show the limitations of an exclusive interpretation of Kant¿s ethics as a deontological ethics of principles. His thoughts are also relevant for a large number of questions of theoretical morality currently under discussion. Thus, the distinction drawn in the Doctrine of Virtue between perfect and imperfect obligations informs the problem of the solvability of moral conflicts and the