 The nineteenth and twentieth centuries saw the development of panentheism as a specific position regarding God’s relationship to the world. The awareness of panentheism as an alternative to classical theism and pantheism developed out of a complex of approaches. Philosophical idealism and philosophical adaptation of the scientific concept of evolution provided the basic sources of the explicit position of panentheism. Philosophical approaches applying the concept of development to God reached their most complete expression in process philosophy’s understanding of God being affected by the events of the world.