The second kind of perception, as already mentioned [Section 1383], is one that is common to everyone—to angels at the peak of perfection and to spirits according to their quality. As soon as another person approaches, they know what that person is like, even if the person says nothing. It reveals itself instantaneously, by a sort of inspiration that is most amazing. Good spirits are recognized not only for the type of goodness they have but also for the type of belief. When they talk, it comes through in every word. Evil spirits are recognized for their wickedness and unbelief, and when they talk, it comes through in every word. The clues are so plain as to be unmistakable.
Something similar can be seen with people on earth. They too can sometimes tell what others are thinking from the gestures, facial expression, and speech of those others, even when their words contradict it. This skill in humans is an earthly one whose origin can be traced to a character trait in spirits that grants them the same ability, and so to an individual’s own spirit and its communication with the world of spirits. This shared perception originates in the Lord’s wish that all blessings spread contagiously and that everyone enjoy mutual love and grow happy as a result. That is why this type of perception also prevails everywhere among spirits.
from Secrets of Heaven, Section 1388