In Spirit and Reality, Nikolai Berdyaev explores the nature of spirit, describes how modernity has obscured the true meaning of spirit by distorting objectifications and symbolizations, and tells how human creative activity, in concert with divine activity, can overcome these distortions and lead us into the kingdom of authentic spiritual life. A great change is needed which will lead us into the kingdom of the spirit; and in this kingdom we will live in a form of ascending and descending spiritual realism; we will be active rather than passive in spirit. God will descend down to us, and we will ascend to him on the wings of our creative spirit. The Russian philosopher Nikolai Berdyaev (1874-1948) was one of the greatest religious thinkers of the twentieth century. His philosophy goes beyond mere thinking, mere rational conceptualization, and tries to attain authentic life itself: the profound layers of existence that are in contact with God's world. Berdyaev directed all of his efforts, philosophical as well as in his personal and public life, at replacing the kingdom of this world with the kingdom of God. According to him, we can all attempt to do this by tapping the divine creative powers which constitute our true nature. Our mission is to be collaborators with God in His continuing creation of the world. This is what Berdyaev said about himself: "Man, personality, freedom, creativeness, the eschatological-messianic resolution of the dualism of two worlds - these are my basic themes."