 The division between secular and theological process philosophy has its roots in the early phase of contemporary process thought in late 19th and the first half of the 20th century, and centers on two views of evolutions. For secular, atheological processists evolution typifies the creative workings of a self-sustaining nature that fulfills the vision of a certain positivist program, dispensing altogether with a God function to explain any of the events in or appertaining to the  universe.[26]  For theological processists like Teilhard de Chardin, however, evolution exhibits God’s handwriting in the book of nature.