 Another conclusion that the new laws-based physics suggested was that the universe was able to run smoothly without requiring an intervening God. The increasingly deterministic understanding of the universe, ruled by deterministic causal laws as, for example, outlined by Pierre-Simon Laplace (1749–1827), seemed to leave no room for special divine action, which is a key element of the traditional Christian doctrine of creation. Newton resisted interpretations like these in an addendum to the Principia in 1713: the planets’ motions could be explained by laws of gravity, but the positions of their orbits, and the positions of the stars—far enough apart so as not to influence each other gravitationally—required a divine explanation (Schliesser 2012). Alston (1989) argued, contra authors such as Polkinghorne (1998), that mechanistic, pre-twentieth century physics is compatible with divine action and divine free will. Assuming a completely deterministic world and divine omniscience, God could set up initial conditions and the laws of nature in such a way as to bring God’s plans about. In such a mechanistic world, every event is an indirect divine act.