Everything in the universe is changeable. Anything changeable is contained by time and space; it has a beginning and end. Anything which has a beginning needs a without beginning one who brings it into existence. For the one who has a beginning cannot be the originator of things since such a one will evidently need another originator. As an unending regress through the originator of each originator is unacceptable reason demands one who is infinitely self-existent and self-subsistent who undergoes no change namely God.