The intellectual biography of Sergei Bulgakov, who moved from Marxism in the field of economics to philosophical idealism and finally to Christian theology, is well known. He is famous for his proposal concerning Sophia, created and divine. However, it is equally interesting the way in which he presents human action and the way in which the creature can transform created reality. In this session we will explore the role of the Holy Spirit in human action and in the theology of history, according to S. Bulgakov's thought.