315. It should be known that to this image of creation the heat, light, and atmospheres of the natural world contribute nothing whatever. It is only the heat, light, and atmospheres of the sun of the spiritual world that do this, bringing that image with them, and clothing it with the forms of uses of the vegetable kingdom. The heat, light, and atmospheres of the natural world simply open the seeds, keep their products in a state of expansion, and clothe them with the matters that give them fixedness. And this is done not by any forces from their own sun (which viewed in themselves are null), but by forces from the spiritual sun, by which the natural forces are unceasingly impelled to these services. Natural forces contribute nothing whatever towards forming this image of creation, for the image of creation is spiritual. But that this image may be manifest and perform use in the natural world, and may stand fixed and be permanent, it must be materialized, that is, filled in with the matters of that world.