Just as everything that is in accord with the divine design corresponds to heaven, everything that is contrary to the divine design corresponds to hell. Everything that corresponds to heaven reflects what is good and true, while what corresponds to hell reflects what is evil and false.
We may now say something about the knowledge of correspondences and its use. We have just stated that the spiritual world, which is heaven, is united to the natural world by means of correspondences; so it is through correspondences that we are given communication with heaven. Heaven’s angels do not think in terms of natural phenomena the way we do, so when we are absorbed in the knowledge of correspondences we can be in the company of angels in respect to the thoughts of our minds. So we can be united to them in regard to our spiritual or inner person.
In order that there might be a union of heaven with humanity, the Word was written in pure correspondences. Absolutely everything in it corresponds. So if we were steeped in a knowledge of correspondences, we would understand the Word in its spiritual meaning and be enabled to know hidden treasures in it that we do not see at all in its literal meaning. The Word does in fact have a literal meaning and a spiritual meaning. The literal meaning consists of the kind of things that are in our world, while the spiritual meaning consists of the kind of things that are in heaven; and since the union of heaven with our world is maintained by correspondences, we have been given a Word in which the details correspond, even down to the last jot.
from Heaven and Hell, Sections 113, 114