While in the popular mind, eternity often simply means existing for a limitless amount of time, many have used it to refer to a timeless existence altogether outside of time. There are a number of arguments for eternity, by which proponents of the concept, principally Aristotle, purported to prove that matter, motion, and time must have existed eternally. Eternity as a timeless existence Augustine of Hippo wrote that time exists only within the created universe, so that God exists outside of ti… (More on Eternity)