It should be known, however, that light in the spiritual world has nothing in common with light in the natural world; they are as different as what is living and what is lifeless. It is plain, then, from what has been said that it is spiritual light and not the natural light before our eyes that enlightens the understanding. Man does not know this, not having known anything hitherto about spiritual light. In the work _Heaven and Hell_ we have shown (nn. 126-140) that spiritual light has its origin in divine wisdom and truth. 167. Having spoken about the light of heaven, we should say something about the light of hell. This also is of three degrees. The light in the lowest hell is like that from fiery coals; in the middle hell like that from the flame of a hearth; and in the highest hell like that from candles and to some like moonlight at night. All this is spiritual light and not natural, for all natural light is dead and extinguishes the understanding. As has been shown, those in hell possess the faculty of understanding called rationality; rationality itself comes from spiritual light and not from natural light. The spiritual light which they have in rationality is turned, however, into infernal light, as the light of day is into the dark of night. [2] Nevertheless, all those in the spiritual world, whether in the heavens or the hells, see in their own light as clearly as man sees in his by day. This is because everyone's eyesight is formed to receive the light in which it finds itself. Thus the eyesight of the angels of heaven is formed to receive the light in which they see, and the sight of the spirits of hell is formed to receive their light; this is comparatively like that of birds of night and bats, which see objects at night and in the evening as clearly as other birds see them by day, for their eyes are formed to receive their light. [3] The difference between the one light and the other appears very clearly, however, to those who look from one to the other. When, for instance, an angel of heaven looks into hell he sees only thick darkness, and when a spirit of hell looks into heaven he sees only thick darkness there. For heavenly wisdom is like thick darkness to those in hell; in turn, infernal insanity is like thick darkness to those in heaven. It is plain from all this that such as a man's understanding is, such is the light he has, and that after death everyone comes into his own light, for he sees in no other. In the spiritual world, moreover, where all are spiritual even to the body, the eyes of all are formed to see by their own light. Everyone's life-love fashions an understanding for itself and thus a light, also, for love is like the fire of life and from this comes the light of life.