The sun of the natural world is pure fire, and by means of this sun the world of nature existed and subsisted.
That nature and its world, by which are meant the atmospheres, and the earths which are called planets, among which is the terraqueous globe on which we dwell, and also each and all of the things which yearly adorn its surface, subsist solely from the sun, which constitutes their center, and which by the rays of its light and the temperings of its heat is everywhere present, everyone knows with certainty from experience, from the testimony of the senses, and from the writings which treat of the way in which the world has become inhabited. And as the perpetual subsistence of these things is from the sun, reason may with certainty conclude that their existence also is thence; for perpetually to subsist is perpetually to exist as they first existed. From this it follows that the natural world was created by Jehovah God secondarily through this sun.  That there are spiritual things and that there are natural things, which are entirely distinct from each other, and that the origin and maintenance of spiritual things is from a sun which is pure love, in the midst of which is the Creator and founder of the universe, Jehovah God, has been heretofore shown; but that the origin and maintenance of natural things is from a sun which is pure fire, and that the latter is from the former, and both from God, follows of itself, as the posterior follows from the prior, and the prior from the first.
 That the sun of nature and its worlds is pure fire, all its effects clearly show; as the concentration of its rays into a focus by optical instruments, from which proceeds fire burning with vehemence and also flame; the nature of its heat, which is similar to heat from elementary fire; the graduation of that heat according to its angle of incidence, whence are the varieties of climate, and also the four seasons of the year; besides many things, from which reason, by the senses of its body, may confirm the truth that the sun of the natural world is mere fire, and also that it is fire in its purity itself.  Those who know nothing concerning the origin of spiritual things from their own sun, but only concerning the origin of natural things from theirs, can scarcely avoid confounding spiritual things and natural things, and concluding, through the fallacies of the senses and thence of the reason, that spiritual things are nothing but pure natural things, and that from the activity of the latter, excited by light and heat, wisdom and love arise. Those, because they see nothing else with their eyes, and smell nothing else with their nostrils, and breathe nothing else with their breast than nature, therefore ascribe all rational things to it also, and thus absorb naturalism, as a sponge does waters. But these may be compared to charioteers who yoke the horses behind the chariot and not before it.  It is otherwise with those who distinguish between spiritual things and natural things, and deduce the latter from the former; these also perceive that the influx of the soul into the body is spiritual, and that natural things, which are of the body, serve the soul for vehicles and means, that it may produce its effects in the natural world. If you conclude otherwise, you may be likened to a crab, which in walking assists its progress with its tail, and draws its eyes backward at every step; and your rational sight may be compared to the sight of the eyes of Argus in the back of his head, when those in his forehead were asleep. These persons also believe themselves to be Arguses when they reason; for they say, Who does not see that the origin of the universe is from nature? and what then is God but the inmost extension of nature? and the like irrational things; of which they boast more than the wise do of rational things.