De Defectu Oraculorum

Again, as for the dread which some people especially have felt, and so use up the whole of matter on the one world, so that nothing may be left over outside to disturb the structure of it by resisting or striking it—this fear of theirs is unwarranted. For if there are more worlds than one, and each of them has received, as its meet portion, substance and matter having a restricted measure and limit, then there will be nothing left unplaced or unorganized, an unused remnant, as it were, to crash into them from the outside. For the law of reason over each world, having control over the matter assigned to each, will not allow anything to be carried away from it nor to wander about and crash into another world, nor anything from another world to crash into it, because Nature has neither unlimited and infinite magnitude nor irrational and disorganized movement. Even if any emanation is carried from some worlds to others, it is certain to be congenial, agreeable, and to unite peaceably with all, like the rays of starlight and

their blending; and the worlds themselves must experience joy in gazing at one another with kindly eyes; and for the many good gods in each, they must provide opportunities for visits and a friendly welcome. Truly in all this there is nothing impossible or fabulous or contrary to reason unless, indeed, because of Aristotle’s[*](Cf. Aristotle, De Caelo, i. 7 (276 a 18).) statements some persons shall look upon it with suspicion as being based on physical grounds. For if each of the bodies has its own particular place, as he asserts, the earth must of necessity turn toward the centre from all directions and the water be above it, settling below the lighter elements because of its weight. If, therefore, there be more worlds than one, it will come to pass that in many places the earth will rest above the fire and the air, and in many places below them; and the air and the water likewise, in some places existing in positions in keeping with nature and in other places in positions contrary to nature. As this, in his opinion, is impossible, the inference is that there are neither two worlds nor more, but only this one, composed of the whole of matter and resting firmly in keeping with Nature, as befits the diversity of its bodies.