ELEMENTS ARE KINDRED THROUGH THEIR COMMON GROUND, THE UNIVERSE-BODY.
The earth was mingled with the upper fire not to produce the stars, but because fire has something terrestrial, as earth has something igneous, as a result of all the bodies being contained within the body of the universe. In short, every one of the elements includes mixture of itself and of the other with which it participates. This results from the interrelating community existing within the universe (the "sympathy"). So each element, without combining with any other, borrows some of its properties. For example, water participates in the fluidity of the air, without however mingling therewith; so the earth does not possess the fire, but derives its brightness from it. On the other hand, a mixture would render all properties common to both elements, confounding them together,[218] and would not limit itself to merely approximating earth and fire, that is, a certain solidity with a certain density. On this subject we can invoke the authority of (Plato[219]), "The divinity lit this light in the second circle above the earth," thereby referring to the sun, which he elsewhere calls "the most brilliant star."
By these words he hinders us from admitting that the sun is anything else than fire. He also indicates that fire has no quality other than light, which he considers as distinct from flame, and as possessing only a gentle heat. This light is a body. From it emanates another being that we, by verbal similarity, also call light, and which we acknowledge to be incorporeal. This second kind of light derives from the former, being its flower and brightness, and constitutes the essentially white (that is, brilliant) body (of lightning, or comets). (Unfortunately, however), the word "terrestrial" (which designates the element allied to the fire, as we have said above), we are wont to regard unfavorably because Plato makes the earth consist of solidity, while we speak of the earth as a unity, though (Plato) distinguishes several qualities within this element.