Correspondence is by nature such that the parts in the human being which possess the greatest amount of life correspond to those communities in heaven which possess the greatest amount of life and consequently the greatest amount of happiness there, such as those communities to which a person's external and internal sensory powers correspond, and which have a link with his understanding and his will. But parts in the human being which possess less life correspond to the kinds of communities where less life is present, such as the layers of the skin which cover the whole body, also the cartilages and the bones which hold together and support everything within the body, as well as the hairs that grow out of the skin. The identity and nature of those communities to which all these parts of the body correspond must also be stated.