6055. Anyone who has no knowledge of the more internal aspects of the human being cannot know about the inflowing of the soul into the body or its interaction with it; for that interaction and inflowing takes place through those more internal aspects. To know about these more internal aspects of the human being one should know about the existence of the internal man and of the external man, and that the internal man exists in the spiritual world and the external in the natural world, so that the former dwells in the light of heaven, the latter in the light of the world. One also needs to know that the internal man is so distinct and separate from the external that, being prior and more internal, it can remain in being without the external, but that the external man, being posterior and more external, cannot remain in being without the internal. In addition one should know that the internal man is the one who is called intellectual or rational, using those terms in their proper sense, since that man dwells in the light of heaven, a light which holds reason and understanding within it. But the external man is one who must be called, strictly speaking, a knowledge-receiver since known facts reside in him, which knowledge derives its light for the most part from things belonging to the inferior light of the world that is brightened and so made living by means of the light of heaven.