315. It should be known that the heat, light and atmospheres of the natural world contribute nothing at all to this image of creation, but that it is attributable solely to the heat, light and atmospheres of the sun of the spiritual world. These carry that image with them and impart it to forms of use belonging to the plant kingdom. The heat, light and atmospheres of the natural world only open seeds, keep their productions in a state of expansion, and induce in them material substances which cause them to endure. However, they accomplish these effects, not in consequence of any forces from their own sun, forces which, regarded in themselves, are powerless, but in consequence of forces from the spiritual sun, by which they are perpetually impelled to these actions. Still, the heat, light and atmospheres of the natural world contribute nothing at all to bestowing on these forms an image of creation. For the image of creation is spiritual. But for this image to be visible and serve a useful purpose in the natural world, and for it to remain fixed and endure, it must assume material form, that is to say, it must be infused with the material substances of that world.