Ralph Waldo Emerson (1803–1882), U.S. essayist, poet, philosopher. "Circles," Essays, First Series (1841, repr. 1847).
Emerson is speaking here about the illusion of permanence and connecting the idea of flux to the non-empirical realm of spirituality. The notion is that spiritual power blooms in the context of change and mutability. If all were permanently stable, Emerson argues, the sacred would not be able to appear in nature. Moons in the solar system and earthly balls dancing off the end of a bat represent the spectrum of possibility in the universe.