" When we think of the size or dimensions of, a room, our ideas limit themselves to the walls, and there they stop. But when our eye, or our imagination darts into space, that is, when it looks upward into what we call the open air, we cannot conceive any walls or boundaries it can have; and if for the sake of resting our ideas we suppose a boundary, the question immediately renews itself, and asks, what is beyond that boundary? and in the same manner, what beyond the next boundary? and so on till the fatigued imagination returns and says, there is no end. "

― Thomas Paine , The Age of Reason