Another astonishing way happiness spreads is through extraction—a process whose nature cannot be grasped by people on earth. Harsh, disturbing elements are removed in an instant, and in the process, something pleasing and happy is presented, with nothing to block it. Once any hindrances are removed, angels stream in and communicate their joy.
Since perception allows one person to see immediately what kind of love and belief another has, people come together in communities insofar as they harmonize, and separate insofar as they conflict. The process is so precise that not the smallest variation fails either to divide or to unite. As a result, communities in the heavens have distinctive characters—as distinct as anyone could possibly imagine. The differences depend on variations in love for the Lord and faith in him, which are countless. From this comes the form of heaven, which is such that it resembles a single human. That form is constantly being perfected.
A wealth of experience has taught me how this kind of perception works, but recounting all of it would take too long. Many times I have heard swindlers talking and perceived not only the presence of fraud but also its nature and the nature of the malice behind it. It is as if an image of their duplicity dwells in every sound they utter. In addition, I have perceived whether the fraud was invented by the speaker or by others talking through the speaker.
It is the same with people who hate. One can see right away the character of their hatred and the factors that go into it, which are more numerous than you could ever be persuaded to believe. When the victims of their hatred are present in person, it creates a pitiable situation for the haters, since whatever thoughts they had entertained or plots they had hatched against the person stand out in plain view.
from Secrets of Heaven, Sections 1393, 1394, 1395