14. The human mind is of three degrees, which are the celestial, spiritual, and natural. In the first degree is the soul, in the second, is the spirit or the mind, and in the third, is the body. It is the same thing, whether we say that a man's mind is of three degrees, or whether we say that the man himself is. For that of the body which is in principles thus where its first is, is called mind. The remaining parts are derived thence, and are continuations. What is the mind, if it is only to the head, except something that is separated or divorced, in which the mind does not exist through continuation? Let autopsy settle this: The origins of the fibers are the glands of the so-called cortical substance; thence proceed the fibers; and after they are bundled together into nerves, they descend and pass through the whole body, weaving it together and constructing it. The celestial degree, in which is the soul, that is, the inmost man, is a semblance of love; the spiritual degree, in which is the mind, that is, the spirit, which is the mediate man, is a semblance of wisdom from love; and the third degree, in which is the body, which is the ultimate man, is the containant of both; without this third degree, the two higher degrees would not subsist. These things can be further demonstrated from the three heavens, the celestial, spiritual, and natural-where such men are. Wherefore the angels of the higher heavens are invisible to the angels of the lower heavens, if the latter approach the former from their own heavens.