90. Since angels are spiritual they can live in no other than spiritual heat and light, while men can live in no other than natural heat and light; for what is spiritual accords with what is spiritual, and what is natural with what is natural. If an angel were to derive the least particle from natural heat and light he would perish; for it is totally discordant with his life. As to the interiors of the mind every man is a spirit. When he dies he withdraws entirely from the world of nature, leaving behind him all its belongings, and enters a world where there is nothing of nature. In that world he lives so separated from nature that there is no communication whatever by continuity, that is, as between what is purer and grosser, but only like that between what is prior and posterior; and between such no communication is possible except by correspondences. From this it can be seen that spiritual heat is not a purer natural heat, or spiritual light a purer natural light, but that they are altogether of a different essence; for spiritual heat and light derive their essence from a sun which is pure Love, and this is Life itself; while natural heat and light derive their essence from a sun which is pure fire, in which (as said above) there is absolutely nothing of life. 91. Such being the difference between the heat and light of the two worlds, it is very evident why those who are in the one world cannot see those who are in the other world. For the eyes of man, who sees from natural light, are of the substance of his world, and the eyes of an angel are of the substance of his world; thus in both cases they are formed for the proper reception of their own light. From all this it can be seen from how much ignorance those think who, because they cannot see angels and spirits with their eyes, are unwilling to believe them to be men. 92. Hitherto it has not been known that angels and spirits are in a totally different light and different heat from men. It has not been known even that another light and another heat are possible. For man in his thought has not penetrated beyond the interior or purer things of nature. And for this reason many have placed the abodes of angels and spirits in the ether, and some in the stars - thus within nature, and not above or outside of it. But, in truth, angels and spirits are entirely above or outside of nature, and are in their own world, which is under another sun. And since in that world spaces are appearances (as was shown above), angels and spirits cannot be said to be in the ether or in the stars; in fact, they are present with man, conjoined to the affection and thought of his spirit; since man is a spirit, and because of that thinks and wills; consequently the spiritual world is wherever man is, and in no wise away from him. In a word, every man as regards the interiors of his mind is in that world, in the midst of spirits and angels there; and he thinks from its light, and loves from its heat.