There are two worlds, the spiritual world, where spirits and angels are, and the natural world, where men are.
That there is a spiritual world, in which spirits and angels are, distinct from the natural world in which men are, has hitherto been deeply hidden even in the Christian world. The reason is, because no angel has descended and taught it by word of mouth, and no man has ascended and seen it. Lest therefore from ignorance of that world, and the uncertain faith concerning heaven and hell resulting from it, man should be infatuated to such a degree as to become an atheistic naturalist, it has pleased the Lord to open the sight of my spirit, and to elevate it into heaven, and also to let it down into hell, and to present to view the quality of both.  Thence it has thus been manifested to me that there are two worlds, which are distinct from each other; one in which all things are spiritual, which is therefore called the spiritual world, and the other in which all things are natural, and thence is called the natural world; and that spirits and angels live in their own world, and men in theirs; and also that every man passes by death from his own world into the other, and in this he lives to eternity. A knowledge of both of these worlds must be given first, in order that influx, which is here treated of, may be disclosed from its beginning; for the spiritual world flows into the natural world, and actuates it in all its parts, both with men and with beasts, and also constitutes the vegetative activity in trees and herbs.