41. Anything that is man's own has no life in it; and when depicted visually it looks like something hard as a bone and black. But anything that comes from the Lord does contain life. It has that which is spiritual and celestial within it, and when depicted visually it looks human and alive. It is perhaps incredible, but nevertheless absolutely true, that every expression, every idea, and every least thought of an angelic spirit is alive. In even the most detailed areas of his thought there is an affection that comes from the Lord, who is life itself. Consequently all that derives from the Lord has life within it, for it contains faith in Him, and is here meant by 'a living creature'. It then has the outward appearance of a body, meant here by that which is moving, or creeping. To man these matters remain arcana, but since the subject here is the living and moving creature, they ought at least to be mentioned here.

4408. The existence of a correspondence between the sight of the eye and that of the understanding is perfectly plain to those who stop to reflect, since the objects that make up the world, each of which derives something from the light of the sun, come in through the eye and store themselves in the memory. They deposit themselves there as visual impressions of those objects, for the things which a person recalls from the memory are seen inwardly by him. They are the source of man's formation of mental images, whose constituent ideas philosophers term material ideas. And when a person sees these objects even more inwardly within himself they present themselves as thought, doing so again as something like visual impressions, though purer ones, whose constituent ideas are called immaterial, and also intellectual. The existence of an interior light holding life, and therefore intelligence and wisdom, within it, which provides the light for the interior sight and meets those impressions which have come in through the external sight, is plainly evident, as also is the fact that the action of the interior light is dependent on the way in which things that are present there from the light of the world are deployed. The things which come in through hearing are also converted inwardly into impressions similar to the visual ones which are formed from the light of the world.