Now, without some grasp of what correspondence is, nothing can be known in clear light about the spiritual world or about its inflow into the natural world, nothing at all about what the spiritual is relative to the natural, nothing in clear light about the human spirit that is called “the soul” and how it affects the body inwardly, nothing about our state after death. Because of all this, I need to define it and explain what it is like. This will also pave the way for matters that are to follow.
irst, I need to state what correspondence is. The whole natural world is responsive to the spiritual world—the natural world not just in general, but in detail. So whatever arises in the natural world out of the spiritual one is called “something that corresponds.” It needs to be realized that the natural world arises from and is sustained in being by the spiritual world, exactly the way an effect relates to its efficient cause.
By “the natural world,” I mean all that extended reality that is under our sun and that receives its light and warmth from it. All the things that are sustained in being from that source belong to that world. The spiritual world, in contrast, is heaven, and to that world belong all the things that are in the heavens.
from Heaven and Hell, Sections 88, 89