The Summary of Physics Restored

192Philosophers call spiritual natures not only those created apart from matter and comprehended by intellect alone, such as the Intelligences, Angels and Daemons are believed to be. They also include natures which, though deriving their origin from matter, escape the examination of the senses through their extreme fineness and nobility. Close to purely spiritual beings, they are perceived more by reason than by sense. Such natures are pure air or ether, the influences of heavenly bodies, innate fire, seminal spirits, plant, animal and vital spirits, and others of this kind. In these the very nature of things consists more truly than in gross bodies. Such natures derive their lineage from Heaven and, in comparison with perceptible things, claim the name and standing of spirits.