" On the cosmological level, the primary polarity is between the expansive impulse that underlies the growth of the universe and the contractive field of gravitation that holds everything together. If the centrifigual force is predominant, the universe will expand indefinitely; if the centripetal, the universe will sooner or later stop growing and begin to contract until everything is annihilated in the Big Crunch. No one knows what will happen. But in the meantime, the interplay between these expansive and contractive principles underlies the processes of cosmic evolution. "

― Rupert Sheldrake , The Rebirth of Nature: The Greening of Science and God