The Summary of Physics Restored

10As the totality of the world consists of a threefold nature, so it is distinguished into three regions: the supercelestial, celestial and subcelestial. The supercelestial, called intelligible, is highest of all, wholly spiritual and immortal, nearest to divine majesty. The celestial occupies the middle place. Having received the lot of the most perfect bodies and abounding in spirits, it pours forth countless powers and life-giving breaths through spiritual rivulets. It cannot undergo corruption, yet is not exempt from change when its period is at last completed. Finally, the subcelestial region, commonly called elemental, occupies the world's lowest tract. Since it is wholly corporeal in itself, it possesses spiritual gifts and benefits, the highest of which is life, only on loan and with repayment due to heaven. Within its bosom no generation occurs without corruption, no arising without passing away.