This paper addresses the phenomenon of judicial greatness by developing a general concept of greatness and applying it to law. Under the view offered in the paper, greatness is connected to theoretical or methodological diversification. When applied to adjudication, this means that great judges are revered because they successfully make a prima facie case for their novel adjudicative methods. This is not a judicial duty but rather a voluntary project. However, once a judge succeeds in making such a prima facie (...) case, he is exempt from other judicial duties. This thesis challenges many theories of judicial duty, which do not allow normative room for supererogatory actions in law. The paper demonstrates these claims by discussing two paradigmatic great judges – Chief Justice Marshall and Justice Holmes. (shrink)