is described by Swedenborg, as follows, in the work on "Heaven and Hell":
"Heaven is distinguished into two kingdoms, of which one is called the celestial kingdom, and the other the spiritual kingdom. The celestial kingdom in general corresponds to the heart, and to all things of the heart in the whole body; and the spiritual kingdom to the lungs, and to all things of the lungs in the whole body. The heart and the lungs also make two kingdoms in man; the heart reigns there by the arteries and veins, and the lungs by the tendinous and motor fibres, both of them in every force and action. In every man, in his spiritual world, which is called his spiritual man, there are also two kingdoms; one is of the will and the other is of the understanding; the will reigns by the affections of good, and the understanding by the affections of truth: these kingdoms also correspond to the kingdoms of the heart and lungs in the body. In like manner in the heavens: the celestial kingdom is the voluntary of heaven, and there the good of love reigns; and the spiritual kingdom is the intellectual of heaven, and there truth reigns: these are what correspond to the functions of the heart and lungs
